Learn how to build Mobile App (Android, iOS) with 3-tier Architecture. Each platform (Android, iOS) could have specifics options (sensors, for example).
We don't need to worry about the persistence's process (saving and retrieving data) because this application uses the online database "mLab".
To execute the application, just enter "ionic serve -l" then the default web browser of the computer will show up the home page. We could choose the platform (Android, iOS) we want to use the application.