Introduction to Queue Data Structure

Queue Data Structure

Last Updated : 20 Jun, 2025

A Queue Data Structure is a fundamental concept in computer science used for storing and managing data in a specific order.

It follows the principle of "First in, First out" (FIFO), where the first element added to the queue is the first one to be removed.
It is used as a buffer in computer systems where we have speed mismatch between two devices that communicate with each other. For example, CPU and keyboard and two devices in a network
Queue is also used in Operating System algorithms like CPU Scheduling and Memory Management, and many standard algorithms like Breadth First Search of Graph, Level Order Traversal of a Tree.

Basics

Implementations in various Programming Languages

Implementing Other Data Structures Using Queue

Easy Problems on Queue

Medium Problems on Queue

Hard Problems on Queue

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Introduction to Queue Data Structure

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