Bluetooth is a low cost, low power, short-range radio technology, originally developed as a cable replacement to connect devices such as mobile phone, handsets and portable computers.
This link offers a Direct, secure, fast & reliable digital transmission of both voice & data. (Cable replacement) by enabling a standardized wireless communication between any electrical device, Bluetooth has created the notion of a personal area network, a kind of close range wireless network that looks set to revolutionize the way people interact with information technology landscapes around them.
No longer do people need to connect, Plug into, install, enable, or configure anything to anything else. Through a ubiquitous standardized communication subsystem, devices will communicate seamlessly. One does not need to know where's one's cellular phone is, or even if it is switched on.
As soon as the web browser appears on the laptop computer screen, a link is established with the phone the Internet service provider is connected to, and the user is surfing the web. The Bluetooth specifications are open, global specification defining the complete system from radio right up to the application level. The protocol stack is usually implemented partly in hardware and partly as software running on a microprocessor, with different implementations partitioning the functionality between hardware and software in different ways