What is a python stack?
A stack is a linear data structure that stores items in a Last-In/First-Out (LIFO) or First-In/Last-Out (FILO) manner. In stack, a new element is added at one end and an element is removed from that end only. The insert and delete operations are often called push and pop.
When is it useful?
To understand Stack at the ground level, think about a pile of books. You add a book at the top of the stack, so the first one to be picked up will be the last one that was added to the stack. Or imagine the undo feature - allowing users to backtrack their actions until the beginning of the session by recording every action of the user.
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