A USB Virtual COM Port (VCP) driver allows a USB device to be recognized by your Windows computer as a traditional serial (COM) port. This is commonly used for communication between a PC and devices like microcontrollers, GPS units, network equipment, or other peripherals that use serial communication protocols. When a USB device is connected to your computer, the VCP driver creates a virtual COM port, enabling the device to be accessed through serial communication software like PuTTY, Tera Term, or any custom software that communicates via COM ports.