Blue tooth Vs Wi-Fi

There is plenty of information on these subjects in a number of on-line encyclopaediae.

According to www.wikipedia.com Bluetooth is an industrial specification for wireless personal area networks. Bluetooth provides a way to connect and exchange information between devices such as mobile phones, laptops, personal computers, printers, GPS receivers, digital cameras, and video game consoles over a secure, globally unlicensed short-range radio frequency. The Bluetooth specifications are developed and licensed by the Bluetooth Special Interest Group.

Bluetooth is a standard and communications protocol primarily designed for low power consumption, with a short range (power-class-dependent: 1 meter, 10 meters, 100 meters) based on low-cost transceiver microchips in each device.[1]

Bluetooth enables these devices to communicate-with-each-other when they are in range. The devices use a radio communications system, so they do not have to be in line of sight of each other, and can even be in other rooms, as long as the received transmission is powerful enough. (See last sentence of next paragraph).

An example of a common Bluetooth device is a wireless over the earphone/microphone connected wirelessly to a cell phone, acting as a headset for that cell phone. Another is a Dongle which is a smart cell phone antenna plugged into a laptop computer via a USB port that mimics a Bluetooth headset for the computer user making it possible for the PC User to communicate through a cell phone account. A growing Bluetooth subculture are industrial spys that access a particular cell phone with Bluetooth capability, of a working business person or perhaps a private eye target, via their laptop who eavesdrop on business or personal conversations, unknown to the cell phone owner.

WiFi:

Wi-Fi is the common name for a popular wireless technology used in home networks, Laptop PC's, Internet connection capable mobile phones, video games and more. Wi-Fi is supported by nearly every modern personal computer operating system and most advanced game consoles. One's Wi-Fi enabled devices can log into the network and the Internet where ever one is close enough to a "Wi-Fi Node" to make a connection, making them highly popular with business persons, travelers and students. Indeed, a whole sub-culture of citizens "hang out" at Wi-Fi hot spots supplied by commercial retail outlets such as coffee shops and food courts in shopping malls using their Wi-Fi Laptop PC's. Another subculture are the growing number of users that "scab on" to neighbors and local businesses that have Wi-Fi capability, rather than subscribe to their own service. This practice slows the "bandwidth" of the bone fide subscriber.