Suggest an editImprove this articleRefine the answer for “In which tasks is a stack most often used?”. Your changes go to moderation before they’re published.Approval requiredContentWhat you’re changing🇺🇸EN🇺🇦UAPreviewTitle (EN)Short answer (EN)A **stack** is most often used in tasks where you need to go back or process data in reverse order, for example in recursion, bracket checking, or undoing actions (undo). **Key point:** a stack is also used for traversing graphs and trees (DFS) and for parsing and compiling code to track nested constructs.Shown above the full answer for quick recall.Answer (EN)ImageA stack is most often used in tasks where you need to **go back** or **process data in reverse order**. The main examples: 1. **Recursion and function calls**: storing arguments, local variables, and return addresses (the system call stack). 2. **Checking bracket validity**: convenient for tracking opening and closing brackets in expressions. 3. **Reverse Polish notation (postfix form)**: when evaluating arithmetic expressions. 4. **Undoing actions (undo)**: storing the history of changes in text editors, graphics editors, and similar. 5. **Traversing graphs and trees (DFS)**: a stack is used to store the vertices that still need to be visited. 6. **Parsing and compiling code**: tracking nested constructs. In all these cases, being able to "go back" to a previous state matters, and that is what makes a stack an ideal tool.For the reviewerNote to the moderator (optional)Visible only to the moderator. Helps review go faster.