What is the Microsoft PS Class Driver?

The Microsoft PS Class Driver (PS stands for Peripheral Subsystem) is a standard, generic driver used by Windows to support basic functionality for certain devices, particularly human interface devices (HIDs) like printers, scanners, mice, and keyboards. This driver is typically employed when Windows does not have a specific manufacturer-supplied driver for the connected device. The "PS Class" refers to a category of devices that follow a particular interface standard defined by Microsoft.

In simpler terms, it's a default driver that Windows uses for devices that are either not recognized automatically or for which no specific driver has been installed. It's designed to ensure that the device works in a basic, functional manner, even if advanced features are not available without the manufacturer's driver.