A USB audio interface is a device that connects musical instruments, microphones, or other audio sources to a computer via a USB port. It converts analog audio signals into digital data, allowing for high-quality recording and playback. This makes it essential for musicians, podcasters, and audio engineers who want to produce professional sound. These interfaces often come with various inputs and outputs, including XLR and 1/4-inch jacks, enabling users to connect multiple devices. Many models also include built-in preamps and audio processing features, enhancing the overall sound quality and providing flexibility in audio production.