A USB DVB-T device is a USB tuner that allows your computer to receive and decode DVB-T (Digital Video Broadcasting - Terrestrial) signals for watching free-to-air digital TV broadcasts. These devices are commonly used with desktop or laptop PCs to access over-the-air TV channels, and they typically come with a USB interface for easy connection to your computer. The Windows driver for the USB DVB-T device ensures that the operating system can properly recognize and communicate with the hardware, enabling you to use the device for TV viewing, recording, and other functions.