Input, Output and Specialist needs
Input are used in everyday tasks such as typing a message on a keyboard, you push a button on the keyboard the computer recognizes what button you pressed and transmits it to your computer screen. Without this pretty much all computers would be useless. The Output is basically the part 2 of the input it basically recognizes what you have done and transmits those instructions onto the screen.
Some users of systems may have Specific Needs: For example people who are Quadriplegic they can't press the buttons on a keyboard, fortunately they can use a Eye-Typer which detects eye movement and blinking into input data so that they can use things like a keyboard. There is also a system called a Puff-Suck System which allows the user to blow/suck to operate switches, this is often used in car travel for handicapped people to be able to drive.
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