Can you name the main types of information storage systems?

The main types of storage systems in Android:

1. Shared Preferences — for storing simple key-value pairs (settings, flags).
2. File system — storing files in internal or external storage.
3. SQLite database — built-in relational database for structured data.
4. Room Persistence Library — an abstraction over SQLite with a convenient API and support for LiveData.
5. Content Providers — mechanism for data sharing between apps.

Each type is suitable for different tasks: settings — Shared Preferences, large structured data — SQLite/Room, files — file system.