input devices

        Keyboard - a device to input text and characters by depressing buttons  as keys or

    Pointing devices
        Mouse - a pointing device that detects two dimensional motion relative to its supporting surface.
            Optical Mouse - uses light to determine mouse motion.
        Trackball - a pointing device consisting of an exposed protruding ball housed in a socket that detects rotation about two axes.
        Touchscreen - senses the user pressing directly on the display on screen

    Gaming devices
        Joystick - a control device that consists of a handheld stick that pivots around one end, to detect angles in two or three dimensions and reports its angle or direction to the device it is controlling.
        Game  - a hand held game controller that relies on the digits (especially thumbs) to provide input.
        Game controller - a specific type of controller specialized for certain gaming purposes.
    Image, Video input devices
         scanner - a device that provides input by analyzing images, printed text, handwriting, or an object.
        Web cam - a video camera used to provide visual input that can be easily transferred over the internet.
    Audio input devices
        Microphone - an device sensor that provides input by converting sound into electrical signals.