what is actually bluetooth technology in cellphones? what are its uses?

Question

i need how to use that technology and also its other uses

Answer 1

Bluetooth is a wireless communications protocol for short proximity.

One of it's common uses is to transfer data between devices. Check your mobile phone manual to find out how to use it as this may differ from device to device.

A word of caution though, never accept any transfer from a device that you don't know it's source as someone maybe sending you a malicious virus.