1. Explain The merits of using a deque to implement a stack in data structure

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stack data structure.

A stack in Data structure is a LIFO structure. Last In First Out. Think of it as a stack of books or a stack of trays in a cafeteria line. when you are in a line in a cafeteria you take the tray that is on the top and the worker place new washed ones also on the top. So deletion and insertion all done at one end, it is called the top of the stack. In Computer Programming Stacks are so important and have too many applications such as the evaluation of Mathematical expressions. Also note that a stack is unlike a queue structure. Queue data structure is FIFO. First In First Out as in a bank teller line.