SQLite is native to both Android and iOS, and every app can create and use an SQLite database if they so desire. In fact, in Android, device contacts, and media are stored and referenced using ...

For more on SQL itself, check out this article. SQLite is an implementation of a relational database, specifically aimed for embedded scenarios. It’s ideal for the likes of an Android app.

The tutorial has two parts: Part one introduces the example app, and how to use a content provider with a local SQLite database. Part two covers data synchronisation.