stack (Last-In-First-Out structure) follows Last-In-First-Out (LIFO) order, supporting push, pop, and peek operations in . You use it when processing needs to remember context for later, like matching brackets or evaluating expressions. The call stack itself is a stack, making recursion and stack solutions interchangeable.
You'll see this in parsing, undo operations, and nested structures. If you can explain these concepts in your own words, you'll solve related problems faster under interview pressure.
