Web Reference: In this section, we’ll explain each Stack operation step by step, with real-life comparisons and clear algorithms to help you visualize the logic. Let’s break down the core operations that define how a stack works: Dec 15, 2025 · A stack is a linear data structure that follows the Last-In-First-Out (LIFO) principle. It can be implemented using an array by treating the end of the array as the top of the stack. Stacks can be implemented by using arrays or linked lists. Stacks can be used to implement undo mechanisms, to revert to previous states, to create algorithms for depth-first search in graphs, or for backtracking. Stacks are often mentioned together with Queues, which is a similar data structure described on the next page.
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