Data structures play a key role in the programming world. They help us to organize our data in a way that can be used efficiently. The stack is one of the simplest data structures.

Let’s learn about the stack and its implementation in Python.

What is a Stack?

A stack is similar to the pile of books, chairs, etc…, in real-life. And it follows the Last-in/First-out (LIFO) principle. It is the simplest data structure. Let’s see the scenario with a real-world example.

Let’s say we have a pile of books as follows.

When we want the third book from the top then, we have to remove the first two books from the top to take out the third book. Here, the topmost book goes last to the pile and comes first of the pile. The data structure stack follows the same principle Last-in/First-out (LIFO) in programming.

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