@Synthesis6117 apps can connect to any external service, including a database.
Cloudron pre-provisions a database and configures an app to use the database. This is part of our packaging. This is true for WP developer and WP managed.
However, for the LAMP app, one cannot pre-configure the database since it's "user" code. You can configure the LAMP app to use any database. However, the backup/restore functionality won't work when using an external database. The backup/restore can only backup and restore what is on the Cloudron - the code in this case.