A USB audio adapter is a small device that connects to a computer or other electronic devices via a USB port. It allows users to add audio input and output capabilities, such as connecting headphones, speakers, or microphones. This is especially useful for devices that lack built-in audio ports or for improving sound quality. These adapters are often plug-and-play, meaning they can be used immediately after connecting without needing additional software. They come in various forms, including simple stereo adapters and more advanced models with features like surround sound or digital audio output.