Bluetooth is an Open wireless protocol for exchanging data over a short distance from fixed or mobile devices, creating a Personal area network (PAN). The The word Bluetooth is an anglicized version of Old Norse Blátönn or Danish Blåtand, the name of the tenth-century king Herald I of Denmark, who united dissonant Danish tribes into a single kingdom.
Bluetooth uses a radio technology called frequency-hopping spread spectrum which chops up the data being sent and transmits chunks of it on up to 79 frequencies. In its basic mode, the modulation is Gaussian frequency shift keying (GFSK).
Frequency range of Bluetooth is very short about 10m (30f), mostly of several mobiles have the same range of frequency. Data transfer rate of blue tooth is 1Mbit/s. Bluetooth works on AD-HOC network which is fully wireless type of network.
The network area of Bluetooth is called as Piconet which allows only 8 devices to be active at a time, and rest of devices are known as parked slaves. A Piconet can consist of upto 256 parked slaves devices. In those 8 devices, one will be master and rest will be slave i.e. only one device can send data and other will recive that data. This condition changes as according to the devices which want to send the data across the Piconet. One Piconet can contect to another Piconet via bridge slave device
Now a days bluetooth range have been increased upto 100m (Class 1) . There are many versions of Bluetooth avaiable in market now a days which provide wide range of frequency. One biggest advantage of Bluetooth is that id do not need line of site because it use radio frequency to transmit data. Devices which uses Bluetooth as its inbuild facility are Mobile phones, Hands-free headset, Mouse, Keyboard, Printer, GPS devices, Bluetooth USBs, Laptops etc.....
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