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 a built-in audio jack or for improving sound quality. These adapters are often plug-and-play, meaning they can be used immediately after being connected without the need for additional software. They are compatible with various operating systems, including Windows, macOS, and Linux, making them versatile for different users and devices.