The AW540FM801 PCI Joystick appears to be a model of joystick or game controller that connects to a computer via a PCI slot, commonly used for adding additional hardware to your system. The driver for this device is a software component that allows your operating system (in this case, Windows) to properly communicate with and utilize the joystick. Without the driver, your system may not recognize the joystick or allow you to use it with games and other applications.