A very basic overview of wireless connections available to your Mac. Included here because it does simply explain some basic terms. However, there is the impression given that you need an Apple Airport Basestation to set up wireless networking in your home or office. This is not so, as is indicated towards the end of the video when connecting to wireless networks in other places is explained.
Basic wireless networking (length 0:02:48, source: http://www.apple.com/findouthow/mac/)
Wifi – used for access data, internet, email
Bluetooth – shorter range compared to wifi. Used to transmit data between close or adjacent devices, i.e headsets or keyboards, mice
Wireless networking in the home – basestation connects to modem. Computer connect wirelessly to basestation or printer
Connecting to existing networks – Airport symbol in menubar, select from list of networks, enter password if prompted to do so
Source Article from http://tech.johnwalker.me.uk/basic-wireless-networking/
Basic wireless networking