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The following chart is a summary of the primary features of Wi-Fi, Zigbee and Bluetooth and some typical applications.

Technologies
Wi-Fi
Zigbee
Bluetooth
Standards
IEEE802.11b/g/a
IEEE802.15.4
IEEE802.15.1
Data Rate
11(b) to 54 (a,g) Mbps
10 – 115 kbps
721 kbps

RF Frequency Band
2.4 and 5 GHz bands
915 MHz, 2.4 GHz 898 Mhz in Europe
2.4 GHz
No. of Nodes
100+
65,000
8
Range
100m
10-75m
8m (Class II, III) to 100m(Class I)
Modulation
DSSS and OFDM
DSSS
FHSS
Topology
Star-access point
Mesh network
Peer to Peer
Current (typ.)
350 ma
30 ma
65 to 179 ma. (Class I)
Battery Life
1-3 hours
Years (at low duty cycle)
4-8 hours (streaming audio)
Applications
Internet access,
Computer networking,
Retail inventory,
Computer peripherals,
Wireless networking
Wireless sensors,
Industrial controls,
Wireless switches,
HVAC,
Meter reading
Streaming audio,
Cell phone,
Hands-free,
Computer peripheral,
Printer cable,
Multimedia

 
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