Stack is a linear data structure that operates on the principle of Last-In, First-Out (LIFO), meaning the most recently added element is the first one to be removed.

Imagine you have a pile of books that you plan to read. You keep adding books to the top of the pile. When you're ready to start reading, you take a book from the top of the pile. The last book you added to the pile is the first one you read. That's LIFO - the principle that stack data structures operate on.

What makes stacks so unique is their simplicity and elegance