Arizona State University (ASU) CSE240 Introduction to Programming Languages Midterm Practice Exam

A queue data structure is characterized by its first-in, first-out (FIFO) operation. This means that the first element added to the queue will be the first one to be removed. When you think of a queue, you can visualize it like a line of people waiting to purchase tickets; the person who arrives first is the one who gets served first.

In terms of operations, when an item is added to the queue, it is placed at the back, and when an item is removed, it is taken from the front. This orderly processing aligns perfectly with real-world scenarios where sequences of operations are processed in the same order they were received.

The structure of a queue typically supports two main operations: adding to the back of the queue (enqueue) and removing from the front (dequeue), reinforcing the FIFO principle. This clear mechanism of operation is why understanding queues is crucial in programming and data manipulation tasks.