How Bluetooth Got Its Name

The name comes from the legendary 10th century Danish King Harald I, who went by the name Bluetooth and was, by all accounts, a good communicator.

The modern-day Bluetooth plays a key role in the field of audio transmissions. One popular use is for small, mobile loudspeakers that can be easily set up wirelessly to play music transmitted from a smartphone or tablet. Users mostly enjoy the ease of set-up.

Source: How Bluetooth connects gadgets | The Hindu