The TechniSat SkyStar USB 2 HD CI is a USB TV tuner designed for receiving digital TV signals (such as DVB-S2, DVB-T, or DVB-C) on your PC, allowing you to watch and record TV programs directly from your computer. The "CI" stands for Common Interface, which allows you to insert a CAM (Conditional Access Module) and use smart cards for encrypted channels, such as premium TV channels.
The Windows driver for the TechniSat SkyStar USB 2 HD CI allows your computer to recognize and interact with the hardware. In addition to the driver, you may need software for viewing TV, recording, and managing channels.