The ATI HDMI Audio Driver is a driver package provided by AMD (formerly ATI) for managing audio over an HDMI (High-Definition Multimedia Interface) connection. This driver enables audio output through an HDMI cable, allowing your PC to send both video and audio signals to a compatible display or AV receiver (such as a TV, monitor, or sound system) via HDMI. The driver is particularly useful for systems with an AMD graphics card or APU (Accelerated Processing Unit) that supports HDMI audio output.