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 bypassing the built-in audio hardware of the device, which may not be optimized for high-fidelity audio. USB DACs connect via a USB port, making them easy to use with various devices, including laptops, desktops, and some smartphones. They often support high-resolution audio formats, allowing users to enjoy clearer and more detailed sound, making them popular among audiophiles and music enthusiasts.