Bluetooth is a radio communication technology for sending and receiving data over short distances from fixed and mobile devices, as well as building personal area network. The Android platform comprises support for Bluetooth network stack, which enables a device to exchange data with other Bluetooth devices wirelessly.
The application framework gives access to the Bluetooth functionality via Android Bluetooth application programming interfaces (APIs).
It offers hands-free talking.
Bluetooth enabled headphones allows you to listen music or attend calls from your smartphone.
It allows you to pair up a keyboard to your device.
It allows you to transfer files between two Bluetooth-enabled devices.