The u-blox Virtual COM Port driver for Windows is typically used to enable communication between a u-blox device (such as GPS modules, GNSS receivers, or other wireless modules) and a Windows-based computer via a virtual COM port (a software-based serial port). This allows the computer to interact with the u-blox hardware using standard serial communication protocols like RS232 or TTL, which is essential for sending and receiving data between the two.
When you connect a u-blox device to a computer, the u-blox software package (or USB drivers) installs a virtual COM port that allows applications on the PC to communicate with the device as though it were a traditional serial port.