For example, it allows you tosideloadapps from outside of the official Google store via your rig.
What Is USB Debugging?
That said, there are several reasons why average users would want to enable debug mode.

Open your unit’sSettingsand tapAbout phoneorAbout tablet.
TapBuild numberrepeatedly until you see a notification that reads “You are now a developer.”
Go back to the mainSystemmenu, then tapDeveloper options.

If using Android Pie, you must tapAdvancedoptionsto reveal the Developer options.
Tap theUSB debuggingtoggle switch.
If your PC doesn’t detect your Android equipment, you may need to download the appropriatedevice driver.

Avoid plugging your unit into public charging ports or using public Wi-Fi networks with debug mode enabled.
Therefore, you should always turn off debugging when you don’t need it.