What The Heck Is Blue Tooth, Anyway?   

Bluetooth is the wireless technology developed by Bluetooth Special Interest Group (SIG), a trade association comprised of leaders in the telecomnunication, computing, automotive, industrial automation and network industries. Bluetooth technology conforms to low cost short range wireless specification for connecting mobile devices and bringing them to market. The used of bluetooth is to connect and transfer information between things like cellphones, laptops and PCs, printers, digital cameras, and video game consoles using radio frequencies securely.

this is from wikipedia
http://en.wikipedia.org/wiki/Bluetooth
then another site telling what bluetooth is
http://www.palowireless.com/infotooth/whatis.asp

Bluetooth is a short range wireless protocol for cellphones and associated devices...you can swap photos or ringtones with friends who also have it,use a wireless handsfree headset,transfer photos to your computer or to an instore photo printing kiosk..it's a useful application to have!

i will tell clearly.......using bluetooth u can transfer ur data to other mobile...for example, if u want to transfer or send a song from ur mobile to your friend's mobile, u have to select that song, u friend should switch on his bluetooth in his mobile, then u select an option send in ur mobile via blue tooth..then the song will b sent to your friend's mobile...thats it...this is bluetooth's function...not only songs, wall papers, pictures, screen savers,e.t.c, dont get confused with above technical responses....

its an earpiece adapter for your phone that is wireless and just fits in your ear and looks star trekkie lol.. some can do other things but its pretty much just a wireless ear piece with microphone that looks ridiculous..

I hope this helps.
http://compnetworking.abo...

Its a devise that you can use to talk on the phone with without actually having the phone to your ear, they say its safer to drive with, not sure about the research on that one, sounds more like a marketing tool. Use your bluetooth to sync music to your phone, telephone numbers, if it came with instructions those are helpful or you can play the person who doesn't know how it works and have somebody at the phone store show you how to do it.

You can use bluetooth to have music,exchange videos or songs with others.If someone has a cellphone with bluetooth and opens the device,then you can also open yours,thus you two can exchange files.

You don't know never mind I'll tell you Its basically used for transferring data from one mobile to another so you can share your favorite music with friends and send images too but only in a limited distance ok.
Make sure to have your antivirus on otherwise you are likely to get a virus installed and I know you don't want that.
So happy sharing...

Bluetooth is short range Wireless (10m~100m), you can transferring data from PC or other cellphone. Bluetooth not just using in your cellphone, but it use in any product (Printer, Scanner, etc.). Data can change to be sound and video, i use it for access to internet with cellphone from PC. PC sending data to cellphone and cellphone received data from PC, and after cellphone accepting data from operator cellphone provider then it will return sending a data to cellphone then PC. But, you know now we can access data from Wireless with a long range (100m~1000km).