A wireless keyboard is exactly the same as a normal computer keyboard except for one major difference: Wireless keyboards transfer typing data to the computer via infrared beams. A beam of information is sent from the keyboard, as you type, to a receiver, which is plugged into the computer. This allows for a cordless experience, which eliminates the potential for another tangled cord behind your computer. It is also common for many consumers to purchase a wireless mouse to compliment a wireless keyboard. This being the case, two wires are now eliminated from the clutter behind your desk.
Source: http://www.wisegeek.com/what-is-a-wireless-keyboard.htm
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