If we look around in our office or home, we find that we are using so many electronic devices which are all connected with power supplies or to each other through cables. For example, just have a look at the back of your computer, you will find a big mesh of wires connecting CPU, monitor, keyboard, mouse, printer etc. with each other. Bluetooth is intended to replace these cables connecting portable and/or fixed electronic devices. This technology was initially conceived by Ericsson and then was adopted by many other companies.
Bluetooth is a standard for a small, cheap radio chip that can be plugged into any electronic device like computers, printers, mobile phones, etc. The chip is designed to replace cables by taking the information generally carried by the cable and transmitting it at a special frequency to a receiver Bluetooth chip, which then gives the information received to the respective electronic device. The electronic devices having this chip are called Bluetooth - enabled.
The main advantages of this technology are its robustness, low complexity, low power and low cost. It can operate in noisy frequency environments too. The Bluetooth radio uses a fast acknowledgement and frequency hopping scheme to make the link robust. Bluetooth radio modules operate in unlicensed ISM band at 2.4GHz, and avoid interference from other signals by hopping to a new frequency after transmitting or receiving a packet. The Bluetooth wireless technology comprises hardware, software and interoperability requirements. It facilitates both data and voice communication.
Mobile phone manufacturers were fast to adopt the technology as it makes communication between two mobile handsets fast and easy without using the service network.
~ use a Bluetooth enabled handsfree headset to communicate with the mobile phone in
your pocket, or even in the other room.
~ Transfer files to/from a compatible PC over a local Bluetooth wireless connection
~ Play wireless multiplayer games over a Bluetooth connection
~ Trasfer files, ringtones, applications etc. between two Bluetooth enabled handsets directly.