Stack
A stack is a fundamental abstract data type (ADT) in computer science that follows the Last-In-First-Out (LIFO) principle, where elements are added (pushed) and removed (popped) from the same end, called the top. It is widely used for managing function calls, undo operations, expression evaluation, and backtracking algorithms. Stacks can be implemented using arrays or linked lists in various programming languages.
Developers should learn stacks because they are essential for understanding recursion, parsing expressions (e.g., in compilers), and implementing features like undo/redo in applications. They are particularly useful in scenarios requiring reverse order processing, such as depth-first search in graphs, browser history management, and balancing symbols in code editors.