A standard APK is the installation file for Android apps. A Mod Menu APK is a hacked version of Geometry Dash where a developer has injected a clickable overlay (the "menu") into the game. This menu allows you to toggle cheats and features on or off while playing.
The World of Geometry Dash Mod Menus on Android: What You Need to Know geometry dash mod menu apk android upd
For the new 2.2 platformer levels, the mod menu adds infinite jump, infinite health, and teleport-to-mouse features. A standard APK is the installation file for Android apps