The Android app tutorial introduces the use of prebuilt Couchbase Lite databases within mobile apps, reducing bandwidth and improving user experience. It builds upon the previous tutorial's basics of CRUD operations using Couchbase Lite, exploring advanced features such as multiple local instances of Couchbase Lite, Full-Text-Search capabilities, and powerful Query API with SQL-like semantics. The tutorial extends an existing app to incorporate a prebuilt "University" database, allowing users to query and retrieve information from the local database, persisting user profile data in the process. By using prebuilt Couchbase Lite databases, developers can streamline their apps' functionality and improve performance, making it suitable for data that does not change frequently.