Zigbee is a wireless communication protocol like wifi and bluetooth. ZigBee defines a network layer above the 802.15.4 layers to support advanced mesh routing capabilities. XBee is the wireless module which uses Zigbee protocol.[ About ZigBee Protocol ]
XBee has an IO port for UART communication (Rx:pin3 Tx:pin2) , such that it can talk to a microcontroller easily. This is a very useful function for a wireless device. If you just need two devices , such a PC and an Arduino , be able to talk to each other wireless , then you can just buy two XBee with function 802.15.4. If you need the information transfer to a long distance through other similar devices wireless , then you should buy the XBee with Mesh Networking function which be called "ZigBee Protocol".
The information and basic idea about Wireless Network , ZigBee , 802.15.4 , Coordinator , Router , End Device , PAN ID , and channel
[ Setup A ZigBee Network ]
The procedures to setup a ZigBee Network , the necessary parameters , and the information of setup a P2P connection
[ API Mode ]
The information about AT Mode and API Mode , How to use API Mode
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