2. Bluetooth

Bluetooth is a type of radio communication and networking protocol combined.

It was developed so devices close to one another could exchange data, without any need for a physical connection.

By close, we mean within about 10 metres of one another even if there is a wall in-between.

This means it is possible to have 'hands-free' phone conversations in the car whilst driving because the car is fitted with bluetooth technology. A great boon to safety, as there were many road accidents caused by distracted drivers before the law on mobile phones changed and the introduction of Bluetooth into new cars.

The picture opposite shows a typical setting-up screen on a smartphone fitted with bluetooth. It allows you to switch it off if you want and it shows all the nearby devices the phone can connect to.