The Microsoft UAA Function Driver for High Definition Audio - CMedia 9880 is a device driver for the CMedia 9880 high-definition audio codec. It enables Windows operating systems to correctly interface with audio hardware that uses the CMedia 9880 chip, ensuring proper functionality for features like sound playback, microphone input, and other audio functions. The UAA (Universal Audio Architecture) is a Microsoft driver model designed to provide support for high-definition audio devices across various Windows platforms.

This driver is often used in systems with integrated sound solutions using the CMedia 9880 chip, which can be found on certain motherboards or audio interfaces.