Google Play Protect includes on-device capabilities that help keep devices and data safe. These on-device services integrate with cloud-based components that allow Google to push updates that constantly improve their functionality.
All Android apps undergo rigorous security testing before appearing in Google Play. Google Play Protect scans 125 billion apps daily to make sure that everything remains spot on. That way, no matter where you download an app from, you know it's been checked by Google Play Protect.