Bluetooth, infrared, wireless - what's the difference?

Don't make the mistake of confusing IrDA and Bluetooth with "WiFi" or "wireless networking" which is a wireless networking system. WiFi has a long range (up to 100 metres) and higher speeds. WiFi is used to network computers in an office or home without using cable.

While proximity communications cannot be used to network a whole office, they have many applications.

Connecting your phone to your computer, PDA, or other phones is easier than ever thanks to Bluetooth or infrared connections.

Nokia - Connection confusion