The WCH PCI Express-PARALLEL driver is typically associated with a PCIe (PCI Express) to parallel port adapter device. This adapter allows a computer to communicate with legacy parallel port devices (such as printers, scanners, or other peripherals that use a parallel interface) via a PCI Express slot. The WCH part of the name refers to WCH (Nanjing WCH Electronics), a Chinese company known for manufacturing USB, serial, and parallel interface controllers, among other semiconductor products.
If you see WCH PCI Express-PARALLEL in your Device Manager, it means you have a parallel port interface card installed on your system, and it requires the appropriate driver for proper functionality.