Introduction to Queue
Explore the queue as a linear data structure that follows the first in, first out (FIFO) rule. Understand core operations such as enqueue, dequeue, and peek, and see how queues support real-world applications including task scheduling, print spooling, data buffering, and breadth-first search in graphs.
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Long before queues were formalized as a data structure, programmers needed a way to manage a growing list of tasks that must be processed in the order they arrive. Early computers handled jobs from multiple users concurrently, and without a defined ordering mechanism, task scheduling was neither fair nor predictable. The queue data structure was introduced to enforce this ordering.
What is a queue?
A queue is a linear data structure that follows the first in, first out (FIFO) principle. This means the first element added to the queue is the first one to be removed.
A queue is analogous to a line of people waiting for service. The first person in line is served first. New entries are added at the back, and removals occur from the front.
