The Belkin F5U103 USB-RS232 Adapter is a USB to serial (RS-232) adapter that allows a computer or device with a USB port to connect to serial devices, like older printers, modems, or other peripherals that use the RS-232 serial communication standard.
The driver for the adapter enables your Windows operating system to recognize the device and function properly, providing the necessary software interface for the USB-to-serial communication. Without the driver, the operating system may not be able to communicate with the adapter correctly, and you may encounter issues like the device being unrecognized or not functioning as expected.