The Koyo USB-Serial Comm Port driver is typically associated with USB-to-serial adapters or devices that allow you to connect serial devices (such as modems, GPS receivers, industrial equipment, or older peripherals) to your computer via a USB port. Koyo is a brand (often linked to industrial or automation equipment) that manufactures USB-to-serial adapters, which enable communication between USB-equipped systems and legacy serial (RS232) devices.

In this case, the Koyo USB-Serial Comm Port driver allows your Windows operating system to recognize and properly communicate with the USB-to-serial adapter, enabling the use of serial communication protocols over a USB connection.