Intel(R) High Definition Audio HDMI is a Windows audio driver that enables the audio output to be transmitted through an HDMI (High-Definition Multimedia Interface) connection. This is typically used when your PC is connected to a display, such as a TV or monitor, via HDMI and you want the audio to be sent along with the video signal. It allows your system to output sound through the HDMI cable instead of through the PC's internal speakers or a separate audio output.