Ii-I/O devices zisetyenziswa ngumntu (okanye yenye i-system) ukuze ixhumane nge-digital processing system. Umzekelo, ii-keyboards nee-mice zaziwa ngokuba zii-input devices zekhompyutha, ngeli lixa ii-monitors kunye nee-printers zisaziwa ngokuba zii-output devices zekhompyutha. Ii-devices zoxhumano oluphakathi kweekhompyutha, ezifana nee-computers, ezifana nee-modems kunye namakhadi e-network, asetyenziswa kwi-input ne-output.