The Conexant D850 56K V9x DFVc Modem is a 56K dial-up modem designed to provide internet access over a standard telephone line. The "V9x" refers to the V.90 and V.92 standards (common for 56K modems), where the modem supports speeds up to 56 kbps. The "DFVc" designation typically indicates the inclusion of Digital Fax Voice capabilities, which allow for fax and voice functionality over the same modem connection.

The Windows driver for this modem is required to allow your computer to communicate with the modem hardware and use it to dial into an Internet Service Provider (ISP) via a telephone line, send/receive faxes, or use voice services (depending on the specific modem configuration and your phone line setup).