A stack is a linear data structure that follows the Last In, First Out (LIFO) principle. This means that the most recently added element is the first to be removed. Stacks are often used in algorithms that require tracking of function calls, managing execution contexts, or evaluating expressions. Operations on a stack typically include push (adding an element to the top) and pop (removing the top element).

Definition: A stack is a linear data structure that follows the Last In, First Out (LIFO) principle. It supports operations like push (add) and pop (remove).

Stack Operations:
1. Push(item): Add item to top of the stack
2. Pop(): Remove and return the top item from the stack

Stacks are used in many areas of computer science, such as in undo/redo operations in applications, expression evaluation in compilers, and parsing tasks. The ability to access only the top element (the most recently added) makes stacks ideal for managing temporary data or reversing operations. In programming, stacks can be implemented using arrays or linked lists, depending on the needs of the program.

While stacks are simple and efficient for certain tasks, they are limited in that you can only interact with the top of the stack. For more flexible access to data, other data structures, such as queues or linked lists, may be more appropriate.