Example Concept: Offline data synchronization typically uses a local database (e.g., SQLite, Room, Core Data) to store data on the device. When the app is offline, user actions are recorded locally. A background service or worker (such as WorkManager on Android or BackgroundTasks on iOS) periodically checks for connectivity and synchronizes changes with the server. Conflict resolution strategies, such as last-write-wins or custom merge logic, ensure data consistency during synchronization.