What is Bluetooth ..??

The name Bluetooth comes from King Harald Blaatand, who lived from 910 to 986.Bluetooth is an open wireless protocol for exchanging data over short distances from fixed and mobile devices, creating personal area networks (PAN). It was originally conceived as a wireless alternative to RS232 data cables. It can connect several devices, overcoming problems of synchronization.

The Bluetooth standard is based on a mode of operation master / slave. So-called "piconet" (in English piconet) network formed by a device and all devices in its range of reach. It can coexist up to 10 piconets within the same coverage area. A master can be connected simultaneously to a maximum of 7 active slave devices (255 in parked mode). Indeed, the devices in a piconet have a logical address of 3 bits, which allows a maximum of 8 devices. The devices known in parked mode are synchronized but do not have a physical address in the piconet.
Bluetooth technology has spread far and wide. It enables the connection and exchange of information among computer-based appliances through low frequency (2.4 GHz) radio signals, thus totally eliminating the need for wires. This way you can use your computer to interface with video game consoles, cell phones, printers, other laptops, digital cameras, and set your Private Area Networks (PANs) without involving any wire connection.
The Bluetooth USB adapter is one of the inventions of Bluetooth technology. If you have computers and other devices that do not have an inbuilt Bluetooth compatibility, and you want to use it with another Bluetooth enabled device, you need not worry because with the help of a Bluetooth USB adapter (commonly known as a dongle), all such devices can be made compatible.
The Bluetooth USB adapter is a 3-inch long device that needs to be inserted in the USB port of your computer, making it compatible with the other Bluetooth enabled device. There are many different brands of Bluetooth adapters available on the market today, so buy the one that supports your headset protocol. With the support of a Bluetooth adapter you can now listen to music using your Bluetooth headset.
This Bluetooth technology has made it possible for people to travel wherever they want, without having to worry about carrying luggage filled with cables and wires to connect their laptop with their printer, their PDA, their fax machine, etc. You simply have to use your Bluetooth USB adapter to connect with any Bluetooth enabled device that you want to use.
Also, the Bluetooth USB adapter enables you to set up your PAN which provides you with a wireless network with which you can communicate with other computers, synchronize your PDAs, send and receive messages from your cell phone, download data from different sources such as your digital camera, MP3 player, etc.
The Bluetooth USB adapter solves your problem of connecting two devices wirelessly even if they are not Bluetooth enabled. Thanks to this versatile technology, communication has never been more easily and conveniently accessed.
Bluetooth is a technology network staff without son (noted for WPAN Wireless Personal Area Network), that is to say technology networks without son of a low range to connect devices together wirelessly. Unlike the IrDa technology (infrared), Bluetooth devices do not require line of sight to communicate, making its use more flexible and allows such a communication from one room to another, in small spaces.

The objective is to enable Bluetooth to transmit data or voice equipment between radio circuit with a low cost, on a radius of about a dozen meters to just under a hundred meters and with low power consumption.

For example, Bluetooth technology is mainly intended to link them, peripherals (printers, mobile phones, household appliances, without auricles son, mouse, keyboard, etc..) Computers or personal digital assistants (PDA), without using a connection wired. Bluetooth technology is also increasingly used in mobile phones, enabling them to communicate with computers or PDAs, and especially with hands-free devices such as Bluetooth headsets. Bluetooth headsets can act as headphones incorporating advanced features remote control.