Android App Bundles is the name for the new file format for Android applications. It is still possible to use the old file format APK. Normally the AAB file format is only used for the production app, because for faster local development the Android build generates an optimized APK file. There are two different options in Android Studio and two different Gradle tasks for the two different file formats:
- APK: Gradle tasks starts with "assemble" followed by the variant name
- AAB: Gradle tasts starts with "bundle" followed by the variant name
For more information go to the official documentation
