ahhhh young Jedi, look up Bluetooth it's an awesome wireless technology that is avialable in cell phones, cars, computers etc. It allows them to communicate with each other wirelessly. right now I've got my computer plugged into the wall and that's it, no other wires. My keyboard has bluetooth in it as does the mouse so there are no wires for either of them and my printer is in another room entirely and is connected via the wireless router that my cable modem is plugged into. When I bring my laptop home from work I don't even have to change anything it automatically sees the network and joins it and I can get online by just turning the computer on. I can also print to the printer from my laptop even though it's not plugged in because the computers "see" each other and can share peripherals.