Overview
This guide does not substitute reading Google Documentation:
What is an .aab?
It's a file format with all the necessary resources to generate optimized APKs.
In a practical manner this is the new format that you need to use to submit an app to Google.
Read here for more detailed explanation: https://developer.android.com/guide/app-bundle
One file format two options:
Option A - AAB signed by Google
Let Google generate an app signing key (recommended).
More than 90% of new apps use Google-generated app signing keys Protects against loss or compromise (the key is not downloadable).
Download distribution APKs signed with the Google-generated key for other distribution channels, or use a different key for them.
Option B - AAB with my own key
Choose your own app signing key.
Keep a local copy of the key for increased flexibility.
Use the key you're already using (for example, if your app is pre-installed).
Increased security risk if local copy is compromised.
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