Your database is where all your games, states, and other information is stored. You can export your database to a file, or import a database file to replace your current one.
You can also reset any database to its default state. This will delete all your games and states, and replace them with the default ones. This can help resolving any issues you may be having.
You can export all your data into a single file to use it on another device, or to keep it as a backup.
Import a save file to replace your current database. This will delete all your games and states, and replace them with the ones in the file.