More in The Data Structures series. A stack is one of the most simplest data structure to understand. If you had data structures in your academia, you already know what it means. It’s a simple Last In First Out (LIFO) queue. What that means is the last element to enter the stack will be first element to go out of the stack. Let’s try to understand the concept first with a few illustrations. The concept Suppose we have an empty container which looks like the container shown in the image below: Empty stack That’s pretty simple to understand. Now suppose again that we “push” a string with value “string1” to this empty stack. The stack now looks like this: Stack with one element That’s pretty simple to