juniorStacks

What is a Stack Data Structure?

Updated Apr 28, 2026

Short answer

A linear data structure that follows the LIFO (Last In, First Out) principle.

Deep explanation

Stacks are fundamental in computer science for managing nested or ordered data. A linear data structure that follows the LIFO (Last In, First Out) principle. They ensure that the last item processed is the first one returned, maintaining a strict temporal order.

Real-world example

Back button functionality in a web browser.

Common mistakes

  • Forgetting to check for emptiness before popping, causing a runtime error.

Follow-up questions

  • What is the space complexity?

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