The DM9601 USB to Fast Ethernet Adapter is a device that allows you to connect your computer to a network via Ethernet using a USB port. This type of adapter is commonly used when a computer lacks an Ethernet port or when you need to provide a wired network connection to a device that only has USB ports (like some laptops, tablets, or other small form-factor devices). The DM9601 is a specific chipset made by Davicom Semiconductor for this purpose, and the USB to Fast Ethernet Adapter is essentially a network interface that converts USB data to Ethernet signals for wired internet connectivity.