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Human Interface Devices (HID) are a class of devices that give structure to the data that will transfered between the device and the host computer. During the enumeration process, the device describes the information that it can receive and send. The HID class is supposed to include devices such as a mouse, joystick, keyboard, etc. Because the host computer knows what the data means a device driver is not neccessary for HID devices, the operating system can supply a generic HID driver. For instance, if you plug in a USB Mouse, it will immediately work because the OS knows how to interpret information received from a mouse. |