ZigBee is a wireless networking protocol built upon the 802.15.4 communication standard.
ZigBee is a wireless networking protocol built upon the 802.15.4 communication standard and is operating on channels in the 900 MHz or 2.4 GHz frequency range. Created for low-cost, low-power, low-data rate applications, it has been adopted by manufacturers of embedded “smart-home” products.
For additional information, see the Wikipedia page on ZigBee or the website of the ZigBee Alliance, the group that maintains the ZigBee specifications and promotes its use.