The Cinergy 400 TV Capture (MK2) is a TV tuner card from the company Terratec, designed to allow users to watch and record TV programs on their PC. The "MK2" version refers to the second revision or model of this device, which is typically used for capturing video and audio from TV broadcasts. It works by connecting an antenna or cable input to the card, which then processes the signal and allows it to be viewed or recorded on a computer.

The Windows driver for the Cinergy 400 TV Capture (MK2) is necessary to enable the hardware to interact properly with the operating system, ensuring that the card functions as expected when using software for TV viewing, recording, or other related tasks.