The PPC900 CDC USB-to-Serial Comm Port is a device driver used to enable communication between a USB (Universal Serial Bus) port and a serial device (such as an RS-232 or RS-485 serial communication port). The driver essentially allows your computer to recognize a USB-to-Serial adapter as a virtual COM (communication) port.
The term "PPC900" typically refers to a specific USB-to-Serial chipset or adapter. "CDC" stands for Communications Device Class, which is a USB class that allows communication with devices like modems, serial communication devices, and more.
When you install the driver for this device, it enables your system to interface with serial peripherals over USB, which is useful for scenarios like connecting serial devices (e.g., industrial controllers, sensors, or networking hardware) to modern computers that lack traditional serial ports.