A queue is a linear data structure that follows the First In, First Out (FIFO) principle. In a queue, the first element added is the first to be removed, similar to a queue at a checkout line where customers are served in the order they arrived. Queues are used in scenarios where data needs to be processed in a sequential order, such as in scheduling tasks, managing requests in a server, or implementing breadth-first search (BFS) in graphs.

Definition: A queue is a linear data structure that follows the First In, First Out (FIFO) principle. It supports operations like enqueue (add) and dequeue (remove).

Queues support two primary operations: enqueue (adding an element to the back) and dequeue (removing an element from the front). Additional operations may include checking the front element, peeking, or checking if the queue is empty. In many programming languages, queues are implemented using arrays or linked lists, or through dedicated data structures like Java’s LinkedList class.

Queue Operations:
1. Enqueue(item): Add item to the back of the queue
2. Dequeue(): Remove and return the item from the front of the queue

Queues are particularly useful in scenarios where processing order is important, such as in simulations, task scheduling, and resource management. They help maintain an orderly flow of data and prevent situations where newer elements are processed before older ones.