A stack is a simple but essential data structure that operates on a Last In, First Out (LIFO) principle. Elements are added to the top of the stack and removed from the top as well. In TypeScript, implementing a stack can be easily done using an array, as arrays in JavaScript/TypeScript support the necessary operations: `push()` to add elements to the stack and `pop()` to remove them. Additionally, `peek()` is commonly implemented to view the top element without removing it. Stacks are used in a wide range of applications, including function call management (where each function call is added to a stack), undo operations in text editors, and expression evaluation in compilers. Although the array-based stack implementation is straightforward, understanding how stacks work is crucial for solving problems like balanced parentheses, depth-first search, and evaluating expressions. Implementing a stack in TypeScript will give you a deeper understanding of how memory and data management can be performed using simple operations.