Stack

In computer science, a stack is an Abstract data type that serves as a collection of elements, with two main principal operations:

1. Push, which adds an element to the collection, and
2. Pop, which removes the most recently added element that was not yet removed.

The order in which elements come off a stack gives rise to its alternative name, LIFO (last in, first out). Additionally, a peek operation may give access to the top without modifying the stack.

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