Google introduced new app publishing format on play console known as Android App Bundle (.aab extension) and is now the official publishing format. It was introduced in Google I/O 2018 and by second half of 2021, all new apps submitted on play console must use this format instead of Android Package(.apk extension) .

What is Android App Bundle ?

An Android App Bundle is a publishing format that includes all your app’s compiled code and resources, and defers APK generation and signing to Google Play.

Google Play uses your app bundle to generate and serve optimized APKs for each device configuration, so only the code and resources that are needed for a specific device are downloaded to run your app. You no longer have to build, sign, and manage multiple APKs to optimize support for different devices, and users get smaller, more-optimized downloads.

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