There are many ways to do wireless communication. When developing wearable technology project, it tend to come in play. At the moment, Xbee is our favorite, although there are many other ways to do wireless communication.
Sparkfun made a great comparison on wireless modules.
Sometimes you do not need large data rate, or you need something that goes long range, smaller power consumption.. so on. You can choose the best fitting module according to your project and needs.
and here are some links to wireless module details:
XBee/Zigbee >> http://www.digi.com/technology/rf-articles/wireless-zigbee.jsp
Wibree >> http://en.wikipedia.org/wiki/Wibree
Bluetooth >> http://www.bluetooth.com/Bluetooth/Products/low_energy.htm
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how to communicate data between two xbee chips
It is possible to get 5.8GHz transmitter and receiver in term XBEE modules?