The HTC NDIS Protocol Driver is a Windows driver that facilitates communication between your HTC mobile device (typically a smartphone or tablet) and your computer via NDIS (Network Driver Interface Specification). This driver enables networking features such as tethering, Internet sharing, or data transfer through the USB connection between your HTC device and your computer.

When you connect an HTC mobile device to your computer, the HTC NDIS Protocol Driver helps to recognize the device as a network interface that can handle data transfer over the USB connection, which is often used for mobile hotspot (tethering) functionality or USB data connections.