The Steinberg USB driver software allows communication between Yamaha audio devices and your computer. It functions as a bridge between the hardware and your computer's operating system, authorizing you to use the audio device with various music production software, including Cubase and Nuendo, for recording and producing music. The Steinberg USB driver ensures a long-lasting and efficient connection between your Yamaha audio device and your computer, allowing for smooth and uninterrupted musical experiences.