APK, XAPK, and OBB Files and ModJoy: A Guide for First-Time APK Users

https://mobileapkroute.timeforchangecounselling.com/why-understanding-new-versus-older-app-versions-matters-when-exploring-apkmodjoy

The first time you install an APK outside a normal app store can feel unfamiliar, so a clear routine helps. That idea is especially useful when you are comparing Android app files and versions