Bluetooth can be thought of as a radio frequency, which operates over a very short distance - just a few feet. It is very useful for temporarily 'pairing up' two devices. I have an iPod with all my iTunes music on it. This will pair up with my 'Bluetooth' headphones - ie headphones which only operate over bluetooth and have no cables. When I am gardening or doing DIY I have my iPod in my pocket and listen to my music (or Spanish course, etc) through the headphones. A sort of latter-day Sony Walkman. My computer will pair up with the same headphones for when I am doing courses or watching videos. In my caravan I have bluetooth speakers for listening to music from my iPod or iPad. My wife and I can pair up our two mobile phones and exchange photos. I hope this gives you an idea of what Bluetooth is and what it can be used for. You will find that most computers have Bluetooth already installed but you must turn it on if you want to use it. The same goes for most mobile phones and tablets and many other devices. You must also 'pair up' devices before they can 'talk' to each other.