A USB Serial Device Windows driver is a software component that allows your Windows operating system to communicate with a device that uses a USB-to-serial interface. This type of device typically converts USB signals into serial (RS-232 or other serial communication) signals, enabling communication between a computer and serial devices like barcode scanners, modems, GPS units, microcontrollers, industrial equipment, and more.

The driver acts as a translator between the USB port and the serial communication protocol, allowing your Windows computer to treat the serial device as if it were connected via a standard COM port.