Wireless LAN is a Local Area Network using wireless technology instead of wires. The media used for exchanging data is usually radio waves in the ISM band.
Wireless LAN is standardized by 802.11 standards.
The phrase "usually radio waves" is important - the standard accommodates for IR also. Almost all laptops and hand held devices has IR built in, it is very inexpensive. But I am not sure, if there is any serious implementation of Wireless LAN over IR available today.
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