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Feedback is where the output of a system is fed back into the input of the system in order to influence the overall result. Input Tracker Ball Touch Pad Light Pen Joystick Scanner Touch Screen Graphics Tablet Mouse Keyboard Barcode Reader QR Reader Microphone Camera Optical Mark Reader Process Sorting Searching Calculations Graphing Storage Information often needs to be stored on the system for use at a later date. Output Printer Monitor / VDU Speakers Alarm