MontBlanc ADB stands for Android Debug Bridge. You must enable Developer Options and USB debugging and connect your phone to a computer. You can then use commands to change stuff on your device. You could severely wreck your device by running the wrong command, as I had to help a user yesterday who removed the ability to use phone and had to factory reset via recovery because their phone was bootlooping.
DO NOT MESS WITH DEVELOPER OPTIONS OR ADB!!!! IT CAN HAVE SERIOUS CONSEQUENCES AND IT SEVERELY BREAKS SECURITY OF THE DEVICE!!!