The Net MD driver is used for connecting Sony's Net MD Walkman (a type of portable mini-disc player) to a computer running Windows. This driver allows your computer to communicate with the Net MD device, enabling functions such as transferring music tracks to the MD Walkman and managing music files.

In addition to the basic driver, you will also need the corresponding software (often called SonicStage or MD Simple Burner) for managing and transferring media to the device.