Stack Data Structure: LIFO Principle, Operations, and Applications

A stack is a data structure that follows the Last-In-First-Out (LIFO) principle. This means that the last element added to the stack will be the first one to be removed. The stack has two main operations: push (add an element to the top) and pop (remove the element from the top). Other operations that can be performed on a stack include peek (view the top element without removing it) and empty (check if the stack is empty). Stacks are commonly used in programming for tasks such as storing function calls, undo/redo operations, and parsing expressions.