Android App Bundles (AABs) were introduced at I/O 2018 to replace Android Package Kits (APKs) as the standard publishing format on the Play Store. Google notes that: ...

Google may be starting to enforce mandatory app bundles on the Play Store, and killing off easily installable APKs in the process.

The prospect of smartphone app ecosystems opening up has gotten lots of folks interested in sideloading apps. Here's how to do it on an Android smartphone.