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

https://mobilegamelane.timeforchangecounselling.com/7-things-to-check-about-package-signatures-before-using-modjoy-apk

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