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A stack is a fundamental data structure that follows the Last-In-First-Out (LIFO) principle, meaning the most recently added element is the first one to be removed. It operates using two primary operations: push (to add an element) and pop (to remove the top element). Stacks are widely used in programming for tasks like function call management, expression evaluation, and backtracking algorithms. They can be implemented using arrays or linked lists, with each method offering different trade-offs in memory and performance. Common applications include browser navigation (undo/redo operations), parsing syntax in compilers, and managing memory allocation. Due to their simplicity and efficiency, stacks are essential in algorithm design and system-level programming. Their predictable structure makes them ideal for orderly data processing.
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