The ASUS Android USB Ethernet RNDIS driver is software that enables your Windows computer to recognize and use an Android device (such as a smartphone or tablet) as a network interface through a USB cable. Specifically, the RNDIS (Remote Network Driver Interface Specification) driver allows the Android device to function as a network adapter, enabling your computer to access the internet or network via the Android device's mobile data connection (tethering), or even a wired network connection from the Android device.

This driver is typically needed when you're connecting your Android device to a Windows PC via USB for USB tethering (sharing your phone's data connection with your computer). The Ethernet functionality comes into play when the phone acts as a network bridge, sharing its internet connection through the USB port as if it were a physical Ethernet adapter.