Android Application Fundamentals

Android package(.apk suffixed archive file).

Containing contents of Android app that are required at runtime.

File that Android-powered devices use to install the app.

Android App Bundle(.aab suffixed archive file).

Containing contents of Android app project including some additional metadata.

Publishing format.

Defering APK generation. -> Generating APKs deligated to App distributing channel (e.g. Google Play).