Dequeue (also known as double-ended queue) can be defined as an ordered set of elements in which the insertion and deletion can be performed at both the ends, i.e. front and rear.
A dequeue, also known as a double-ended queue, is an abstract data type that supports insertion and deletion of elements from both the front and the rear of the queue. In other words, it allows elements to be added and removed from both ends. This data structure provides more flexibility compared to a regular queue or stack, as it allows operations like insertion and deletion at both ends in constant time. Dequeues are commonly used in scenarios where elements need to be efficiently added or removed from both ends, such as implementing certain algorithms or data structures like breadth-first search or maintaining a sliding window in a streaming algorithm.