The Motorola USB RNDIS Device is a driver for a feature commonly used in Motorola smartphones (and some other devices) that enables USB networking. RNDIS stands for Remote Network Driver Interface Specification, and it allows the device to communicate with a computer over a USB connection as a network device, effectively enabling the device to share its internet connection with the computer, or vice versa.

In simpler terms, this driver enables a phone or device to be recognized as a network adapter over a USB cable, allowing data transfer between your computer and the device through USB as if the phone were a network interface.