Stacks are data structures that follow the Last-In-First-Out (LIFO) principle, meaning the last item inserted into a stack is the first one to be deleted.
In other words, a stack is a list of elements that are accessible only from one end of the list, which is called the Top of Stack (ToS).
A real-world example is a stack of plates. In the above image, we can see that the plate that is inserted last is the first one to be taken off.
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