The SCI USB2Serial driver is a software driver that allows a USB-to-serial adapter to work with your computer's operating system (Windows, in this case). These adapters are often used to connect devices that communicate via a serial (RS-232) port, such as industrial equipment, networking devices, or older hardware, to a computer via a USB port. The SCI USB2Serial driver enables the computer to recognize the USB-to-serial adapter and allow software on your PC to communicate with the connected serial device.