ZigBee is similar to Bluetooth and connects to wireless devices. It is a low cost and energy efficient application that has been around since the 1990's. The devices work very differently than Bluetooth and the markets don't interfere.
yale was introduced zigbee in 25 sep 2010
quoting from stack exchange: "Zigbee", or IEEE 802.15.4, is a protocol. As such, it has no "programming language".
Yes. Actually we can communicate with ZigBee module through UART. So UART itself is a full Duplex communication. So we can use ZigBee for full Duplex communication.
IEEE
500000 ...........
The ZigBee module is a collection of high level protocols used for communication that can be used to create personal area networks from digital radios.
It depends on the application. RFID usually means passive tags, low cost and no battery needed but maximum range only a few inches. Zigbee ia a PAN network (the nodes all have batteries) range is many yards. RFID tags generally cost less ($5?) than Zigbee nodes ($25?) but prices vary with quantity. With RFID to locate something you must scan it from a few inches away. With Zigbee you can detect it from anywhere in the building. But, Zigbee does not inherently give any location information
ZigBee is a standard (rules, specifications, etc.) of a wireless network. This network aims specifically for home devices and appliances by making each 'node' 'speaks' with another, and benefit from each other.
2.400 Ghz - 2.483 Ghz
ZigBee operates in the industrial, scientific and medical (ISM) radio bands: 868 MHz in Europe, 915 MHz in the USA and Australia, and 2.4 GHz in most jurisdictions worldwide.
Fred Eady has written: 'Hands-On ZigBee'
Zigbee isn't really suitable for use in mobile phones. Zigbee is a specification for communication protocols and digital radios used in wireless monitoring and control systems. In very simplified terms, the specification states that a Zigbee device must use very little power, have a relatively low data transfer rate, and must be powered by batteries that are not rechargeable. In fact, a Zigbee-certified device must run at least 2 years before battery replacement is required. (There are many other features, but I won't go into those here.) This makes Zigbee ideal for remote sensing and data collecting applications, where in many cases the units can't be reached easily to replace batteries. In contrast, Bluetooth is designed for higher data rates (4 times the maximum rate of Zigbee), longer range (up to 100 metres), and relatively frequent recharging of batteries. This is what consumers have typically come to expect from devices used for short-range wireless data transfer. So .. while Zigbee and Bluetooth are both short-range wireless specifications, they are designed to be used for very different purposes.