Bluetooth is relatively new technology but it has grown into becoming one of the most important tools of connecting different pieces of technology together. It is a wireless connecter that exchanges data between different sources. This has changed the technology market in ways that was never thought possible as it has been included in many new pieces of hardware since the late 1990s. Operating over radio waves, it is very similar to Wi-Fi; however only one device can share its data so it is great for connecting to equipment without wires.
For further information read the other pages explaining the origins of the technology and where it is being used now.