USB Audio Class 10 and 20 DAC Device Driver are drivers used to support specific USB audio devices, particularly Digital-to-Analog Converters (DACs) that adhere to the USB Audio Class 10 or 20 standard. These standards are part of a specification that allows USB audio devices (like DACs, audio interfaces, and sound cards) to communicate with a computer, typically without needing proprietary drivers, as long as they conform to certain USB Audio Class standards.