Service binding is a feature that only large systems like Cloud Foundry support till now. Even Kubernetes does not have a functional implementation, the Red Hat operator is deprecated. It is a very useful feature, it allows you to configure a Postgres/MySQL service once and then each new app can easily bind and get a unique schema/database within the main database instance.

I have been building the OpenRun https://github.com/openrundev/openrun project over the last three years. Recently added support for Postgres and MySQL service bindings. After you configure the admin credentials for your database service, any new app can just ask for a binding and get a unique schema/database. Backups, monitoring, capacity planning etc can be done once for the main database, instead of repeating it for every new app.