What databases have you used in developing Android applications?

When developing Android applications, I used several types of databases:

• SQLite — an embedded relational database available on all Android devices. Used for storing structured data with SQL queries.

• Room — a wrapper library over SQLite that simplifies database operations by providing a convenient API and support for annotations to define entities and DAOs.

• SharedPreferences — for storing small key-value pairs, such as user settings.

• Realm — an object-oriented database used for more complex cases requiring high performance and ease of use.

The choice of database depends on the application's requirements and the volume of data.