Now bluetooth word has become so common that even layman can say what is it and where it is used and for what purpose bluetooth is used?
i will tell you more later about bluetooth but this time i will tell you.
How does this name "bluetooth" came in to existance? and what is the meaning of bluetooth?

The word Bluetooth was borrowed from the 10th century, second King of Denmark, King Harald Bluetooth. King Harald Bluetooth was well known for bringing together Scandinavia. He played a major role in uniting Denmark and Norway and in the introduction of Christianity. To show the significance of bringing together different devices and enabling communication between them, Bluetooth technology got its name after this king. so, you got this knowledge. This is the secret of meaning of bluetooth.
There is no other technical reason to it's name. it is just the King of Denmark who is the meaning of bluetooth.
Bluetooth is a technology, whereby, devices communicate wirelessly to achieve data transfer at the rate of 720kbps within a range of 10 to 100 meters. It operates in the unlicensed ISM (Industrial Scientific and Medical) band at 2.4 gigahertz.