The Trendchip USB ADSL Modem is a device used to connect your computer to an ADSL (Asymmetric Digital Subscriber Line) internet service via a USB connection. Trendchip is a brand that produces chipsets for broadband modems, and the Trendchip USB ADSL Modem typically uses a Trendchip chipset to interface with your ADSL line. The modem connects your computer to the internet via the telephone line, and the Windows driver allows the operating system to properly communicate with the modem.