01. What is Wi-Fi

Wi-Fi is the the use of Radio Waves to transmit information, and create a network.  Wi-Fi uses frequencies at 2.4, 3.6, and GHz.

This link http://www.jneuhaus.com/fccindex/spectrum.html has information about specific uses of frequencies.

Spectrum picture

Microwave ovens use some of the same frequencies.  There are some other thing that use this frequency, but I believe they are not common. (NSA Lighting)

Wikipedia  Wi-Fi Article

http://en.wikipedia.org/wiki/IEEE_802.11

Wi-Fi Interferance

http://searchmobilecomputing.techtarget.com/generic/0,295582,sid40_gci1162230,00.html