A form of technology which uses radio waves as opposed to wires to integrate two devices (i.e. mobile phones, tablets, computers).
Bluetooth products contain a small chip, bluetooth radio and software enabling a swift connection. When both devices have connected; this is known as pairing, the two devices will have to grant permission before there is a confirmed conjunction.
This form of connection is known as a piconet, this is basically a series of devices merged together using bluetooth technology.