I have google exhausted,but have not find a clear answer. If you regard it as a repeat others',please make sure again.
As explanation is appreciated!
My Google research some like follow:
Are unaligned android APK's the same as unsigned APK? need to generate release apk that is unsigned
They only emphaized the difference but not mention their relationship.
The unaligned Apk is an intermediate Apk.
When we run app, first, the unaligned apk is generated. after that , the unaligned apk gets aligned and produces the aligned apk which is the your app-debug.apk.
For more information read documentaion click here