A USB DAC (Digital-to-Analog Converter) is a device that converts digital audio signals from a computer or other digital source into analog signals that can be played through speakers or headphones. This process enhances sound quality by providing clearer and more detailed audio compared to standard built-in sound cards. USB DACs connect to devices via a USB port, making them easy to use with laptops, desktops, and even some smartphones. They often support high-resolution audio formats, allowing users to enjoy music and other audio content with improved fidelity and depth, making them popular among audiophiles and music enthusiasts.