What is AppleMobileDeviceHelper on macOS?

/Library/Apple/System/Library/PrivateFrameworks/MobileDevice.framework/Versions/A/AppleMobileDeviceHelper.app/Contents/MacOS/AppleMobileDeviceHelper

Synchronisation between an iOS devices and a PC

Apple Mobile Device Support is used for the synchronisation between an Apple mobile iOS devices (iPod, iPhone or iPad) and a PC through iTunes.

The binary is a part of AppleMobileDeviceHelper application.