WLAN - Wireless LAN
The WLAN supports network communication over short distances using radio or infrared signals instead of traditional network cabling. WLANs often extend an existing wired local area network.
Wi-Fi - Wireless Fidelity
The term Wi-Fi refers a group of industry standards for wireless communication including 802.11b and 802.11g.
Bluetooth
Bluetooth is one way to make a cell phone or PDA communicate on wireless networks. Bluetooth technology is fairly slow and short range, but you can do some very useful things with it.
Wireless Access Point
An access point (AP) is a specially configured node on a wireless local area network (WLAN). Access points act as a central transmitter and receiver of WLAN radio signals.
Hotspot
A wireless hotspot is a public location where Wi-Fi Internet access can be obtained.
WISP - Wireless Internet Service Provider
A WISP (Wireless Internet Service Provider) offers public wireless network services. WISPs often install wireless hotspots that provide Internet access and local printer access to mobile computers.