Bluetooth is a wireless technology which has a transfer rate of 1 Mbps to 3 Mbps that to up to the distance of 10 meters.
In 2000's Bluetooth was used to exchange data without using wires or cables over short distances.
Nowadays it is not used to exchange data.There are more faster technologies present to do that now.But it is still popular to devices like speakers,headphones etc which can be connected by Bluetooth without using wires.
