{"id":38069,"date":"2025-06-24T10:41:04","date_gmt":"2025-06-24T05:11:04","guid":{"rendered":"https:\/\/www.iquanta.in\/blog\/?p=38069"},"modified":"2025-06-24T15:53:05","modified_gmt":"2025-06-24T10:23:05","slug":"queue-in-data-structure-explained-its-types-applications","status":"publish","type":"post","link":"https:\/\/www.iquanta.in\/blog\/queue-in-data-structure-explained-its-types-applications\/","title":{"rendered":"Queue in Data Structure Explained: Its Types &amp; Applications"},"content":{"rendered":"\n<p>Queue is a fast and flexible data structure in the computer science domain. Remember we are standing in a line and purchasing tickets, the person who comes first serves first in that situation.  In the similar manner queue works on the principle of FCFS (First Come First Serve) and in different books you got to know this term by the FIFO (First In First Out) concept.&nbsp;<\/p>\n\n\n\n<p>Among the diverse data structures, queues stand out for their simplicity and practicality because the queue follows FIFO structure (the first element in the queue will serve first). This functionality of queues makes them fast and flexible in managing and storing data.<\/p>\n\n\n\n<p>In this blog, we will cover the introduction of queue in data structure, types of queue, circular and priority queue, complexity analysis of queue, all basic operations performed in queue data structure along with their applications.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><a href=\"https:\/\/chat.whatsapp.com\/B6weknl7133BQXjPva0pgB\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"159\" src=\"https:\/\/www.iquanta.in\/blog\/wp-content\/uploads\/2025\/01\/DSAWHATSAPPBANNER-2-19-1024x159.jpg\" alt=\"\" class=\"wp-image-41472\" srcset=\"https:\/\/www.iquanta.in\/blog\/wp-content\/uploads\/2025\/01\/DSAWHATSAPPBANNER-2-19-1024x159.jpg 1024w, https:\/\/www.iquanta.in\/blog\/wp-content\/uploads\/2025\/01\/DSAWHATSAPPBANNER-2-19-300x47.jpg 300w, https:\/\/www.iquanta.in\/blog\/wp-content\/uploads\/2025\/01\/DSAWHATSAPPBANNER-2-19-768x119.jpg 768w, https:\/\/www.iquanta.in\/blog\/wp-content\/uploads\/2025\/01\/DSAWHATSAPPBANNER-2-19-1536x238.jpg 1536w, https:\/\/www.iquanta.in\/blog\/wp-content\/uploads\/2025\/01\/DSAWHATSAPPBANNER-2-19-2048x317.jpg 2048w, https:\/\/www.iquanta.in\/blog\/wp-content\/uploads\/2025\/01\/DSAWHATSAPPBANNER-2-19-150x23.jpg 150w, https:\/\/www.iquanta.in\/blog\/wp-content\/uploads\/2025\/01\/DSAWHATSAPPBANNER-2-19-696x108.jpg 696w, https:\/\/www.iquanta.in\/blog\/wp-content\/uploads\/2025\/01\/DSAWHATSAPPBANNER-2-19-1068x166.jpg 1068w, https:\/\/www.iquanta.in\/blog\/wp-content\/uploads\/2025\/01\/DSAWHATSAPPBANNER-2-19-1920x298.jpg 1920w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure><\/div>\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_77 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.iquanta.in\/blog\/queue-in-data-structure-explained-its-types-applications\/#What_is_Queue_in_Data_Structure\" >What is Queue in Data Structure ?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.iquanta.in\/blog\/queue-in-data-structure-explained-its-types-applications\/#Types_of_Queue_in_Data_Structure\" >Types of Queue in Data Structure&nbsp;<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.iquanta.in\/blog\/queue-in-data-structure-explained-its-types-applications\/#Linear_Queue_Data_Structure\" >Linear Queue Data Structure<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.iquanta.in\/blog\/queue-in-data-structure-explained-its-types-applications\/#Circular_Queue_Data_Structure_Circular_Workflow\" >Circular Queue Data Structure (Circular Workflow)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.iquanta.in\/blog\/queue-in-data-structure-explained-its-types-applications\/#Priority_Queue_Data_Structure\" >Priority Queue Data Structure<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.iquanta.in\/blog\/queue-in-data-structure-explained-its-types-applications\/#Deque_Data_Structure_Double_%E2%80%93_Ended_Queue\" >Deque Data Structure (Double &#8211; Ended Queue)<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.iquanta.in\/blog\/queue-in-data-structure-explained-its-types-applications\/#Queue_Operations_in_Data_Structure\" >Queue Operations in Data Structure<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.iquanta.in\/blog\/queue-in-data-structure-explained-its-types-applications\/#Enqueue_Operation_Inserting_an_element_in_queue\" >Enqueue Operation (Inserting an element) in queue<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.iquanta.in\/blog\/queue-in-data-structure-explained-its-types-applications\/#Peek_Operation\" >Peek Operation<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.iquanta.in\/blog\/queue-in-data-structure-explained-its-types-applications\/#Dequeue_operation\" >Dequeue operation<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.iquanta.in\/blog\/queue-in-data-structure-explained-its-types-applications\/#Is_Full_operation_To_check_whether_the_queue_is_full_or_not\" >Is Full ( ) operation (To check whether the queue is full or not)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.iquanta.in\/blog\/queue-in-data-structure-explained-its-types-applications\/#Is_Null_operation_To_check_whether_the_queue_is_Null_or_not\" >Is Null ( ) operation (To check whether the queue is Null or not)<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.iquanta.in\/blog\/queue-in-data-structure-explained-its-types-applications\/#Complexity_Analysis_of_Queue\" >Complexity Analysis of Queue<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.iquanta.in\/blog\/queue-in-data-structure-explained-its-types-applications\/#Application_of_Queue_Data_Structure\" >Application of Queue Data Structure<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/www.iquanta.in\/blog\/queue-in-data-structure-explained-its-types-applications\/#Process_scheduling_and_process_management_in_operating_systems\" >Process scheduling and process management in operating systems<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/www.iquanta.in\/blog\/queue-in-data-structure-explained-its-types-applications\/#Network_traffic_management_in_computer_networks\" >Network traffic management in computer networks<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/www.iquanta.in\/blog\/queue-in-data-structure-explained-its-types-applications\/#Customer_service_domain\" >Customer service domain<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/www.iquanta.in\/blog\/queue-in-data-structure-explained-its-types-applications\/#Frequently_Asked_Questions\" >Frequently Asked Questions<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/www.iquanta.in\/blog\/queue-in-data-structure-explained-its-types-applications\/#What_is_a_Queue_in_data_structure_and_how_does_it_work\" >What is a Queue in data structure and how does it work?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/www.iquanta.in\/blog\/queue-in-data-structure-explained-its-types-applications\/#What_are_the_main_operations_of_a_Queue\" >What are the main operations of a Queue?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/www.iquanta.in\/blog\/queue-in-data-structure-explained-its-types-applications\/#What_are_the_different_types_of_Queues\" >What are the different types of Queues?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/www.iquanta.in\/blog\/queue-in-data-structure-explained-its-types-applications\/#Where_are_Queues_used_in_real_life_or_programming\" >Where are Queues used in real life or programming?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/www.iquanta.in\/blog\/queue-in-data-structure-explained-its-types-applications\/#What_is_the_difference_between_Stack_and_Queue\" >What is the difference between Stack and Queue?<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\" id=\"h-what-is-queue-in-data-structure\"><span class=\"ez-toc-section\" id=\"What_is_Queue_in_Data_Structure\"><\/span><strong>What is Queue in Data Structure ?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><a href=\"https:\/\/www.iquanta.in\/blog\/queue-in-data-structure-explained-its-types-amp-applications\/(opens in a new tab)\">Queue<\/a> is a fundamental concept of managing and storing data in the data structure (linear data structure). Queue is opened from both the end that makes it flexible and fast for inserting and deleting elements in data structure. There are different terminologies that we are using in queue to understand its representation-<\/p>\n\n\n\n<ul>\n<li><strong>Enqueue (Insertion operation in queue)&nbsp;<\/strong><\/li>\n<\/ul>\n\n\n\n<p>Enqueue operation of queue inserts elements in a queue. Insertion of elements in the queue done from the rear end.<\/p>\n\n\n\n<ul>\n<li><strong>Dequeue (Deletion operation in queue)&nbsp;<\/strong><\/li>\n<\/ul>\n\n\n\n<p>Deletion operation of the queue removes elements from the queue. Deletion will be done from the front end of the queue.<\/p>\n\n\n\n<p>The representation of the queue looks like the arrangement of elements in the list where both the ends are opened. Pictorial representation of the queue in data structure depicted below :&nbsp;&nbsp;<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img decoding=\"async\" width=\"724\" height=\"361\" src=\"https:\/\/www.iquanta.in\/blog\/wp-content\/uploads\/2024\/12\/queue-diagram.png\" alt=\"queue in data structure\" class=\"wp-image-38074\" style=\"width:375px;height:auto\" srcset=\"https:\/\/www.iquanta.in\/blog\/wp-content\/uploads\/2024\/12\/queue-diagram.png 724w, https:\/\/www.iquanta.in\/blog\/wp-content\/uploads\/2024\/12\/queue-diagram-300x150.png 300w, https:\/\/www.iquanta.in\/blog\/wp-content\/uploads\/2024\/12\/queue-diagram-150x75.png 150w, https:\/\/www.iquanta.in\/blog\/wp-content\/uploads\/2024\/12\/queue-diagram-696x347.png 696w\" sizes=\"(max-width: 724px) 100vw, 724px\" \/><figcaption class=\"wp-element-caption\">Representation of Queue<\/figcaption><\/figure><\/div>\n\n\n<p>There are some cases when we are performing deletion and insertion in a queue. We have to consider two pointers in the queue i.e, front pointer and rear pointer.<\/p>\n\n\n\n<p><strong>Case 1<\/strong> : If queue is empty that means there is no element in queue.<\/p>\n\n\n\n<p><strong>Front &gt; Rear&nbsp; or Front = Rear = -1&nbsp;<\/strong><\/p>\n\n\n\n<p><strong>Case 2 : <\/strong>If queue is not empty that means there is at least one element in the queue.<\/p>\n\n\n\n<p><strong>Front &lt; Rear&nbsp;<\/strong><\/p>\n\n\n\n<p><strong>Case 3 : <\/strong>If there is only one element in the queue.<\/p>\n\n\n\n<p><strong>Front = Rear<\/strong><\/p>\n\n\n\n<p><strong>Case 4 : <\/strong>For enqueue operation&nbsp;<\/p>\n\n\n\n<p><strong>Rear =&nbsp; Rear + 1<\/strong><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img decoding=\"async\" width=\"775\" height=\"391\" src=\"https:\/\/www.iquanta.in\/blog\/wp-content\/uploads\/2024\/12\/queue-diagram-1.png\" alt=\"queue diagram \" class=\"wp-image-38079\" style=\"width:369px;height:auto\" srcset=\"https:\/\/www.iquanta.in\/blog\/wp-content\/uploads\/2024\/12\/queue-diagram-1.png 775w, https:\/\/www.iquanta.in\/blog\/wp-content\/uploads\/2024\/12\/queue-diagram-1-300x151.png 300w, https:\/\/www.iquanta.in\/blog\/wp-content\/uploads\/2024\/12\/queue-diagram-1-768x387.png 768w, https:\/\/www.iquanta.in\/blog\/wp-content\/uploads\/2024\/12\/queue-diagram-1-150x76.png 150w, https:\/\/www.iquanta.in\/blog\/wp-content\/uploads\/2024\/12\/queue-diagram-1-696x351.png 696w\" sizes=\"(max-width: 775px) 100vw, 775px\" \/><\/figure><\/div>\n\n\n<h2 class=\"wp-block-heading\" id=\"h-types-of-queue-in-data-structure-nbsp\"><span class=\"ez-toc-section\" id=\"Types_of_Queue_in_Data_Structure\"><\/span><strong>Types of Queue in Data Structure&nbsp;<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>There are different types of queue we are using in data structure for managing and storing data efficiently.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-linear-queue-data-structure\"><span class=\"ez-toc-section\" id=\"Linear_Queue_Data_Structure\"><\/span><strong>Linear Queue Data Structure<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>This Queue is simply behaving like a simple queue data structure where elements can be accessed sequentially through the indices positions.&nbsp;Linear Queue maintains the FIFO order to simply manage elements in the queue. If we are using a fixed size array in a linear queue then memory management is quite complicated as we have lost a lot of memory.&nbsp;<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"781\" height=\"431\" src=\"https:\/\/www.iquanta.in\/blog\/wp-content\/uploads\/2024\/12\/diagram-2.png\" alt=\"diagram 2\" class=\"wp-image-38080\" style=\"width:363px;height:auto\" srcset=\"https:\/\/www.iquanta.in\/blog\/wp-content\/uploads\/2024\/12\/diagram-2.png 781w, https:\/\/www.iquanta.in\/blog\/wp-content\/uploads\/2024\/12\/diagram-2-300x166.png 300w, https:\/\/www.iquanta.in\/blog\/wp-content\/uploads\/2024\/12\/diagram-2-768x424.png 768w, https:\/\/www.iquanta.in\/blog\/wp-content\/uploads\/2024\/12\/diagram-2-761x420.png 761w, https:\/\/www.iquanta.in\/blog\/wp-content\/uploads\/2024\/12\/diagram-2-150x83.png 150w, https:\/\/www.iquanta.in\/blog\/wp-content\/uploads\/2024\/12\/diagram-2-696x384.png 696w\" sizes=\"(max-width: 781px) 100vw, 781px\" \/><\/figure><\/div>\n\n\n<p>Here, we have two ends: front end and rear end in the simple queue data structure. Insertion of elements performed at the rear end and deletion of elements performed at the front end in the FIFO order. If the memory is full in the linear queue then overflow condition occurs.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-circular-queue-data-structure-circular-workflow\"><span class=\"ez-toc-section\" id=\"Circular_Queue_Data_Structure_Circular_Workflow\"><\/span><strong>Circular Queue Data Structure (Circular Workflow)<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Circular queue works in a circular workflow in a queue data structure, its first element connected to the last element and more memory efficient in comparison to the linear data structure. In the circular queue data structure we are wrapping the elements around. In a circular queue data structure if we are inserting an element and due to space if it is required to wrap around our element to the front end then we can do it.&nbsp;<\/p>\n\n\n\n<p>If overflow condition occurs in a circular queue data structure then there is no space left to wrap up the spaces. Here is the pictorial representation of using circular queue data structure for better understanding of the concept.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"696\" height=\"453\" src=\"https:\/\/www.iquanta.in\/blog\/wp-content\/uploads\/2024\/12\/circular-queue.png\" alt=\"Circular Queue in Data Structure\" class=\"wp-image-38081\" style=\"width:315px;height:auto\" srcset=\"https:\/\/www.iquanta.in\/blog\/wp-content\/uploads\/2024\/12\/circular-queue.png 696w, https:\/\/www.iquanta.in\/blog\/wp-content\/uploads\/2024\/12\/circular-queue-300x195.png 300w, https:\/\/www.iquanta.in\/blog\/wp-content\/uploads\/2024\/12\/circular-queue-645x420.png 645w, https:\/\/www.iquanta.in\/blog\/wp-content\/uploads\/2024\/12\/circular-queue-150x98.png 150w\" sizes=\"(max-width: 696px) 100vw, 696px\" \/><figcaption class=\"wp-element-caption\"><strong>Circular Queue in Data Structure<\/strong><\/figcaption><\/figure><\/div>\n\n\n<p>Note : In Circular queue modulo operation required for the rear and front end operations whereas in linear (simple) queue data structure start and end represented by the indices (positions) of the sequentially arranged list (fixed array) in a queue data structure.<\/p>\n\n\n\n<p><strong>Therefore,&nbsp; Rear=(Rear + 1) % size of array.<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-priority-queue-data-structure\"><span class=\"ez-toc-section\" id=\"Priority_Queue_Data_Structure\"><\/span><strong>Priority Queue Data Structure<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"929\" height=\"370\" src=\"https:\/\/www.iquanta.in\/blog\/wp-content\/uploads\/2024\/12\/Priority-Queue.png\" alt=\"priority queue in data structure\" class=\"wp-image-38082\" style=\"width:427px;height:auto\" srcset=\"https:\/\/www.iquanta.in\/blog\/wp-content\/uploads\/2024\/12\/Priority-Queue.png 929w, https:\/\/www.iquanta.in\/blog\/wp-content\/uploads\/2024\/12\/Priority-Queue-300x119.png 300w, https:\/\/www.iquanta.in\/blog\/wp-content\/uploads\/2024\/12\/Priority-Queue-768x306.png 768w, https:\/\/www.iquanta.in\/blog\/wp-content\/uploads\/2024\/12\/Priority-Queue-150x60.png 150w, https:\/\/www.iquanta.in\/blog\/wp-content\/uploads\/2024\/12\/Priority-Queue-696x277.png 696w\" sizes=\"(max-width: 929px) 100vw, 929px\" \/><figcaption class=\"wp-element-caption\"><strong>Priority Queue in Data Structure<\/strong><\/figcaption><\/figure><\/div>\n\n\n<p>This data structure is a special version where arrangement of elements are according to their priority values. Each element has their own priority value, same or different associated with it accordingly.<\/p>\n\n\n\n<p>We can implement priority queues with different data structures like linked lists, arrays as well as heap&nbsp;data structure (min- heap and max- heap data structure) . <\/p>\n\n\n\n<p>If we want to dequeue (remove an element) from the priority queue data structure then we have to remove the element first with the highest priority associated with it and then remove the element with the lowest priority (priority of elements in a priority queue decides according to the situation).<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-deque-data-structure-double-ended-queue\"><span class=\"ez-toc-section\" id=\"Deque_Data_Structure_Double_%E2%80%93_Ended_Queue\"><\/span><strong>Deque Data Structure (Double &#8211; Ended Queue)<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Deque is a special type and advanced version of the queue. This queue allows both insertion and deletion operations from both the ends of the queue data structure.<\/p>\n\n\n\n<p>The deque data structure is more flexible and fast in comparison to the linear and priority queue data structure. If we want to push elements at the front or from the back in the deque data structure we generally do it in O (1) time complexity. If we have to pop the elements from both the ends we generally do it in O (1) complexity&nbsp;which is really good in terms of optimizing the code structure.<\/p>\n\n\n\n<p>Below is the pictorial representation of the deque data structure that helps you to understand how the operations in deque actually performed.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1006\" height=\"272\" src=\"https:\/\/www.iquanta.in\/blog\/wp-content\/uploads\/2024\/12\/Double-ended-queue.png\" alt=\"double ended queue\" class=\"wp-image-38107\" srcset=\"https:\/\/www.iquanta.in\/blog\/wp-content\/uploads\/2024\/12\/Double-ended-queue.png 1006w, https:\/\/www.iquanta.in\/blog\/wp-content\/uploads\/2024\/12\/Double-ended-queue-300x81.png 300w, https:\/\/www.iquanta.in\/blog\/wp-content\/uploads\/2024\/12\/Double-ended-queue-768x208.png 768w, https:\/\/www.iquanta.in\/blog\/wp-content\/uploads\/2024\/12\/Double-ended-queue-150x41.png 150w, https:\/\/www.iquanta.in\/blog\/wp-content\/uploads\/2024\/12\/Double-ended-queue-696x188.png 696w\" sizes=\"(max-width: 1006px) 100vw, 1006px\" \/><\/figure><\/div>\n\n\n<h2 class=\"wp-block-heading\" id=\"h-queue-operations-in-data-structure\"><span class=\"ez-toc-section\" id=\"Queue_Operations_in_Data_Structure\"><\/span><strong>Queue Operations in Data Structure<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>There are basic operations we have performed in a queue data structures:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-enqueue-operation-inserting-an-element-in-queue\"><span class=\"ez-toc-section\" id=\"Enqueue_Operation_Inserting_an_element_in_queue\"><\/span><strong>Enqueue Operation (Inserting an element) in queue<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Enqueue operation is a basic operation to perform on elements when we have to insert elements in the queue data structure. Generally we add elements in the queue from the rear end using the rear pointer.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-peek-operation\"><span class=\"ez-toc-section\" id=\"Peek_Operation\"><\/span><strong>Peek Operation<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Peek operations resembles the basic pop and push operation in the stacks and queues. With the help of pop ( ) operation we will return the element from the front of the queue list without actually removing the element from the queue.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-dequeue-operation\"><span class=\"ez-toc-section\" id=\"Dequeue_operation\"><\/span><strong>Dequeue operation<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Dequeue operation in queue used to perform the deletion operation (remove an element from the queue) .Generally we are removing the elements from the queue using the front pointer from the front end.&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-is-full-operation-to-check-whether-the-queue-is-full-or-not\"><span class=\"ez-toc-section\" id=\"Is_Full_operation_To_check_whether_the_queue_is_full_or_not\"><\/span><strong>Is Full ( ) operation (To check whether the queue is full or not)<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>This operation is performed in the queue to check whether the given function checks with the elements in a queue to find whether the given queue is full or empty for&nbsp; the given situation.&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-is-null-operation-to-check-whether-the-queue-is-null-or-not\"><span class=\"ez-toc-section\" id=\"Is_Null_operation_To_check_whether_the_queue_is_Null_or_not\"><\/span><strong>Is Null ( ) operation (To check whether the queue is Null or not)<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>This operation is performed in the queue to check whether the given function checks with the elements in a queue to find whether the given queue is Null or not for the given situation.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-complexity-analysis-of-queue\"><span class=\"ez-toc-section\" id=\"Complexity_Analysis_of_Queue\"><\/span><strong>Complexity Analysis of Queue<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>According to the different operations we have performed in the queue of various versions we have time complexities of each operation mentioned in the table listed below :<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Types of Queues<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>Enqueue operation&nbsp;<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>Dequeue operation&nbsp;<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>Peek ( ) operation&nbsp;<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>Space Complexity<\/strong><\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Deque(Double &#8211; Ended Queue)&nbsp;<\/td><td class=\"has-text-align-center\" data-align=\"center\">O ( 1 )<\/td><td class=\"has-text-align-center\" data-align=\"center\">O ( 1 )<\/td><td class=\"has-text-align-center\" data-align=\"center\">O ( 1 )<\/td><td class=\"has-text-align-center\" data-align=\"center\">O ( n )<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Priority Queue&nbsp;<\/td><td class=\"has-text-align-center\" data-align=\"center\">O ( log n&nbsp; )<\/td><td class=\"has-text-align-center\" data-align=\"center\">O ( log n&nbsp; )&nbsp;<\/td><td class=\"has-text-align-center\" data-align=\"center\">O ( 1 )<\/td><td class=\"has-text-align-center\" data-align=\"center\">O ( n )<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Circular Queue&nbsp;<\/td><td class=\"has-text-align-center\" data-align=\"center\">O ( 1 )<\/td><td class=\"has-text-align-center\" data-align=\"center\">O ( 1 )<\/td><td class=\"has-text-align-center\" data-align=\"center\">O ( 1 )<\/td><td class=\"has-text-align-center\" data-align=\"center\">O ( n )<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/chat.whatsapp.com\/B6weknl7133BQXjPva0pgB\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"159\" src=\"https:\/\/www.iquanta.in\/blog\/wp-content\/uploads\/2025\/01\/DSAWHATSAPPBANNER-2-20-1024x159.jpg\" alt=\"\" class=\"wp-image-41473\" srcset=\"https:\/\/www.iquanta.in\/blog\/wp-content\/uploads\/2025\/01\/DSAWHATSAPPBANNER-2-20-1024x159.jpg 1024w, https:\/\/www.iquanta.in\/blog\/wp-content\/uploads\/2025\/01\/DSAWHATSAPPBANNER-2-20-300x47.jpg 300w, https:\/\/www.iquanta.in\/blog\/wp-content\/uploads\/2025\/01\/DSAWHATSAPPBANNER-2-20-768x119.jpg 768w, https:\/\/www.iquanta.in\/blog\/wp-content\/uploads\/2025\/01\/DSAWHATSAPPBANNER-2-20-1536x238.jpg 1536w, https:\/\/www.iquanta.in\/blog\/wp-content\/uploads\/2025\/01\/DSAWHATSAPPBANNER-2-20-2048x317.jpg 2048w, https:\/\/www.iquanta.in\/blog\/wp-content\/uploads\/2025\/01\/DSAWHATSAPPBANNER-2-20-150x23.jpg 150w, https:\/\/www.iquanta.in\/blog\/wp-content\/uploads\/2025\/01\/DSAWHATSAPPBANNER-2-20-696x108.jpg 696w, https:\/\/www.iquanta.in\/blog\/wp-content\/uploads\/2025\/01\/DSAWHATSAPPBANNER-2-20-1068x166.jpg 1068w, https:\/\/www.iquanta.in\/blog\/wp-content\/uploads\/2025\/01\/DSAWHATSAPPBANNER-2-20-1920x298.jpg 1920w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-application-of-queue-data-structure\"><span class=\"ez-toc-section\" id=\"Application_of_Queue_Data_Structure\"><\/span><strong>Application of Queue Data Structure<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-process-scheduling-and-process-management-in-operating-systems\"><span class=\"ez-toc-section\" id=\"Process_scheduling_and_process_management_in_operating_systems\"><\/span><strong>Process scheduling and process management in operating systems<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Process scheduling in the operating system is done on the basis of FCFS (First Come First Serve) approach. Operating systems manage different queues like Job queue, ready queue, device queues etc for efficiently performing their process management.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-network-traffic-management-in-computer-networks\"><span class=\"ez-toc-section\" id=\"Network_traffic_management_in_computer_networks\"><\/span><strong>Network traffic management in computer networks<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Routers and switches generally use queues to manage the data in the form of packets (networking term of data used in network layer) before forwarding to the next available device.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-customer-service-domain\"><span class=\"ez-toc-section\" id=\"Customer_service_domain\"><\/span><strong>Customer service domain<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>In a customer service domain calls are placed in a queue until you find the next agent in a process. Customers in a customer service are arranged in the FIFO (First In First Out) workflow the way they arrive in the system.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-frequently-asked-questions\"><span class=\"ez-toc-section\" id=\"Frequently_Asked_Questions\"><\/span><strong>Frequently Asked Questions<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_is_a_Queue_in_data_structure_and_how_does_it_work\"><\/span><strong>What is a Queue in data structure and how does it work?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>A Queue is a linear data structure that follows the First-In-First-Out (FIFO) rule, which means the element added first is removed first. Think of it like a line at a movie ticket counter so that people join from the back and leave from the front. You add elements using enqueue() and remove them using dequeue().<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_are_the_main_operations_of_a_Queue\"><\/span><strong>What are the main operations of a Queue?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul>\n<li>Enqueue() \u2013 Add an element at the rear of the queue.<\/li>\n\n\n\n<li>Dequeue() \u2013 Remove an element from the front of the queue.<\/li>\n\n\n\n<li>Front() \u2013 Get the first element without removing it.<\/li>\n\n\n\n<li>isEmpty() \u2013 Check if the queue is empty.<\/li>\n\n\n\n<li>isFull() \u2013 (For fixed-size queues) Check if the queue is full.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_are_the_different_types_of_Queues\"><\/span><strong>What are the different types of Queues?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul>\n<li>Simple Queue \u2013 Follows FIFO.<\/li>\n\n\n\n<li>Circular Queue \u2013 Last position is connected back to the first to make a circle.<\/li>\n\n\n\n<li>Priority Queue \u2013 Elements are dequeued based on priority, not arrival time.<\/li>\n\n\n\n<li>Double-Ended Queue (Deque) \u2013 Elements can be added or removed from both ends.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Where_are_Queues_used_in_real_life_or_programming\"><\/span><strong>Where are Queues used in real life or programming?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul>\n<li>CPU Scheduling \u2013 Tasks are lined up and executed in order.<\/li>\n\n\n\n<li>Print Spooling \u2013 Documents are printed one after another.<\/li>\n\n\n\n<li>Call Center Systems \u2013 Calls are queued for agents.<\/li>\n\n\n\n<li>Data Stream Buffers \u2013 Like in video streaming apps.<\/li>\n\n\n\n<li>Breadth-First Search (BFS) in Graph Algorithms.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_is_the_difference_between_Stack_and_Queue\"><\/span><strong>What is the difference between Stack and Queue?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>A Stack follows Last-In-First-Out (LIFO) the last item added is removed first. A Queue, on the other hand, follows First-In-First-Out  (FIFO) in which the first item added is removed first. In simple terms, a stack is like a stack of plates, while a queue is like a line at a grocery store.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Queue is a fast and flexible data structure in the computer science domain. Remember we are standing in a line and purchasing tickets, the person who comes first serves first in that situation. In the similar manner queue works on the principle of FCFS (First Come First Serve) and in different books you got to [&hellip;]<\/p>\n","protected":false},"author":560,"featured_media":38089,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1075,1073],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.4 (Yoast SEO v21.9.1) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Queue in Data Structure Explained: Its Types &amp; Applications - iQuanta<\/title>\n<meta name=\"description\" content=\"In this blog, we will cover the introduction of queue in data structure, types of queue in data structure, circular and priority queue....\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.iquanta.in\/blog\/queue-in-data-structure-explained-its-types-applications\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Queue in Data Structure Explained: Its Types &amp; 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