Could you explain what is meant by data migration between databases?

Data transfer between databases is the process of extracting data from one database and loading it into another. This may be required during migration to a new system, merging data from different sources, or backup.

In Android applications, this is often related to transferring data between local databases (e.g., SQLite) or between a local database and a remote server.

Example: when updating an app, it may be necessary to transfer data from an old database structure to a new, modified schema to preserve user data.

Main steps of transfer:

1. Export data from the source database (e.g., in CSV or JSON format).
2. Transform data if necessary (e.g., change format or structure).
3. Import data into the target database.

In Android, Room is often used for database operations, supporting schema migrations and helping with data transfer within the app.