The final method you might consider to connect your Arduino wirelessly is with a wireless LAN shield. I will not cover Wi-Fi in detail, but rather just show you how to connect to Wi-Fi and point you in the general direction. Wi-Fi is clearly the most complex of the different ways to communicate, but it is a very common wireless communication tool used today. To know more about Wi-Fi, visit www.squidoo.com/what-is-wifi or www.radio-electronics.com/info/wireless/wi-fi/ieee-802-11-standards-tutorial.php.
In order to connect to a wireless network, you'll need a Wi-Fi shield. The following is an image of the standard Arduino Wi-Fi shield:
Place the shield onto the Arduino Uno and you are ready to connect to a wireless network.