So what is Bluetooth for?

I couldn't post this in the thread for "Dummies", so I will ask here. What is the purpose of the Bluetooth on my laptop? I know there are headsets with bluetooth for cell phones. Is this what it is for?
Are there other things (uses or devices) for my Laptop's bluetooth to connect to or do?

 

For now, headsets, speakers, keyboards, and mice. In the future, who knows all the possibilities?

 

Duh.
I have a logitech bluetooth keyboard/mouse on my other computer.

I think I saw something about a bluetooth printer too. I need to google that.

 

Back on the cell phone side of things, you can also wirelessly transfer files between a phone and your computer. Right clicking any file in Windows gives you the "Send to" menu which has a "Bluetooth Device" option.