Trendnet TU2-ET100 is a USB 2.0 to 10/100Mbps Fast Ethernet Adapter that enables a computer to connect to a wired network through a USB port, providing a stable and reliable internet connection. It's compatible with various operating systems including Windows 7, Vista, XP, 2000, Mac OS X 10.4, 10.5, 10.6, and supports both 32-bit and 64-bit architectures.