ModJoy and APK, XAPK, and OBB Files: A Beginner’s Guide for Android Users

https://apkquestcorner.zenbloomer.com/posts/frequently-asked-questions-about-new-versus-older-app-versions-and-mod-joy

A beginner does not need to know every Android term before making a careful choice. APK, XAPK, and OBB labels describe different ways Android apps and large game assets may be packaged or delivered