Depending on the type of build you want to create, you'll use one of three types:
Different build types
1. Test Build
The Android Test build, as the name implies, is for testing purposes only. A test build can be installed on a device via an SD card.
2. Google Play
A build of the app that you will be submitting to the Google Play store.
In order to create any type of build, the build settings for your app must contain an Android application ID.