A Stack is a linear data structure that follows the LIFO principle — Last In, First Out. Like a stack of plates: you add and remove from the top only.
Operations:
push(item) — add to top O(1)
pop() — remove from top O(1)
peek() — view top O(1)
isEmpty() — check if empty O(1)
Applications:
- Undo/redo functionality
- Browser history (back/forward)
- Function call stack
- Depth-First Search (DFS)
- Expression evaluation and parsing
- Balanced parentheses checking
Space Complexity: O(n) for n elements
Related algorithms
Frequently asked questions
- What is Stack?
- A Stack is a linear data structure that follows the LIFO principle — Last In, First Out. Like a stack of plates: you add and remove from the top only.
- What is the complexity of Stack?
- Space: O(n)
- Who is this Stack visualizer for?
- The Stack visualization targets beginner-level learners in the Data Structures category. Useful for students, interview prep, and hands-on review.
- What algorithms are related to Stack?
- In the same category (Data Structures) you can explore: Queue, Linked List, Hash Table. Each has an interactive visualization.