*Sigh*
Since the name a standard keyboard connector doesn't seem to ring a bell, I take it your experience with computers is fairly limited?
PS/2 is a type of connector commonly used for keyboards. Nowadays the USB keyboards begin dominating the market, but PS/2 ones are not difficult to find (just ask at your local computer store) and are still widely used. Most new motherboards still have PS/2 keyboard and mouse ports.
A dummy's guide to changing your keyboard to a PS/2 one:
1. Turn off the computer.
2. Unplug the wireless module of your current keyboard from the USB port.
3. Locate a purple PS/2 port on the back of the computer's case. It looks like the one
here
4. Plug in the PS/2 keyboard.