What are practical use cases for the Memento pattern?

The Memento pattern is used whenever you need to save and restore the state of an object without exposing its implementation details. Key use cases: Undo/redo in text editors, graphic tools, and IDEs (each state before an edit is a memento). Database savepoints/transactions — rolling back to a known good state. Game save files — capturing the full game state at a checkpoint. Wizard forms — storing the state of each step so the user can navigate back. Configuration snapshots — allowing users to revert to a previous configuration. The pattern is appropriate when an object's state is complex and encapsulation must not be broken to save it.