A component in App Platform is any deployable, billable, run-time software element in your app. A component can be a database, a service, a worker, or a static site.

Create a managed relational database from directly within App Platform for use in your app in development or in production.
Create and configure a static site in App Platform
Create and configure background workers in App Platform
How to allow cross-origin resource sharing on DigitalOcean App Platform.
Create and configure services in App Platform