The Structure
Unlike an array, you can only interact with a stack at one specific end: the Top. You place items on top, and you remove items from the top.
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A Stack is a linear data structure that operates purely on the Last-In-First-Out (LIFO) principle.
Unlike an array, you can only interact with a stack at one specific end: the Top. You place items on top, and you remove items from the top.
Think of a stack of plates in a cafeteria. You always place a new plate on top of the pile. When you need a plate, you take the top one. You can't easily pull from the bottom!
Stacks are perfect for scenarios requiring state reversal or backtracking: Undo/Redo features, Browser History (Back button), and evaluating mathematical expressions.