The USB Ethernet RNDIS Gadget driver is typically used when you are connecting a device (like a smartphone, tablet, or embedded system) to a Windows computer via USB and want to use the device as a network interface (essentially allowing it to act as an Ethernet adapter). The RNDIS (Remote Network Driver Interface Specification) protocol is used to provide a network connection over USB, enabling data transfer between the device and the computer.

In simpler terms, the USB Ethernet RNDIS Gadget driver allows a device with RNDIS support to communicate over a network (like the internet or a local network) using a USB connection to your Windows computer, effectively treating the USB connection as an Ethernet link.