An introduction to the queue data structure that supports First In First Out operation. In this lesson, we will learn about the queue and its applications, and will answer a few programming questions.

The queue is similar to the stack but with some fundamental differences. It’s an abstract data type with the following operations defined on it:

  • Enque (Key): Insert an element in the collection.
  • Deque(): Remove the oldest added element from the collection.
  • isEmpty(): Determine whether the queue is empty or not.
  • isFull(): Determine whether the queue is full or not.

    All of the above operations take O(1) time complexity. The queue can be implemented using a linked list and an array.

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