Shared Preferences is a simple key-value store for storing small amounts of primitive data. It's good for storing user settings, preferences, etc. You can save and retrieve data using the SharedPreferences API.
Internal Storage
You can save files directly on the device's internal storage. Files saved here are private to your app and not accessible to other apps or the user unless the device is rooted. Use the openFileInput() and openFileOutput() methods to read and write files.
External Storage
You can save files on the device's external storage (SD card). Files saved here are accessible to the user and other apps. Use the getExternalFilesDir() method to get a directory for saving files. Make sure to request the WRITE_EXTERNAL_STORAGE permission.
SQLite Database
SQLite is a lightweight, serverless, transactional SQL database engine. It's good for storing structured data. You can create a SQLite database using the SQLiteOpenHelper class. SQLite databases are stored in the app's private internal storage.
