bluetooth means that 2 devices having bluetooth can interact wireless, on the frequancy of 2.4 GHz. For example, you have a notebook/laptop with bluetooth and a printer with bluetooth, you activate them, and you can print something without having to put a USB cable from the laptop to the printer. The same goes for PDAs (Palm, etc.), cell phones, mouse, keyboard, etc. If you don't have a device with bluetooth, you can buy a bluetooth adapter (USB), and that device becomes one with bluetooth.
For example, if you are in car with a laptop, cell phone and a Palm, all with bluetooth, you don't need wires between them, they interact among them with the help of this bluetooth cip they have, on the radio frequency of 2.4 GHz.
Detailed enough?
