What is a database in an app?
A database is where an app keeps its data in an organised form, so it can save, find and change it quickly. On iPhone, data can live in a local database on the device, for example with Apple's SwiftData, or in a cloud database on a server, shared between devices and people.
More about Database
Local data works offline and stays on the phone, but it doesn't follow you to another device. Cloud data needs a backend, a connection and usually a sign-in, and in return it syncs and can be shared.
Database with Borel
Borel picks what fits your app: data that only lives on one phone stays on the device and needs no cloud, while accounts and data shared between people or devices go to the app's own cloud database, which Borel runs.
Related terms
Make your iPhone app in Borel
Describe it in your own words. Borel writes it in Swift, builds it on its own Mac and puts it on your iPhone.