What is Stack (data structure)?

Overview

A stack is like a stack of plates where you can only add or remove the top plate. When you push a new item onto the stack, it sits on top of the previous items, and when you pop an item off, you remove the one that was added last. This behavior makes stacks useful for scenarios where you need to keep track of tasks or operations in a specific order, such as undo functions in software applications. In software development, stacks are commonly used for managing function calls and local variables. When a function is called, its information is pushed onto the stack, and when it finishes, that information is popped off. This helps keep track of where the program is in its execution and allows for efficient memory management, as data can be easily added and removed without complex operations. A real-world example of a stack is a stack of books. You can only take the top book off the stack, and if you want to read a book that is lower down, you have to remove the books above it first. This concept of accessing the most recently added item first is important in programming, especially when dealing with recursive algorithms or backtracking problems.