"Wi-Fi" is a type of wireless networking protocol that allows devices to communicate without cords or cables. Wi-Fi is technically an industry term that represents a type of wireless local area network (LAN) protocol based on the 802.11 IEEE network standard. It's the most popular means of communicating data wirelessly, within a fixed location.
There are many wi-fi hotspots available to the public today, including airports, hotels, Starbucks, Panera Bread, and other free wi-fi hotspots.
Wi-Fi works with no physical wired connection between sender and receiver by using radio frequency (RE) technology, a frequency within the electromagnetic spectrum associated with radio wave propagation. When an RF current is supplied to an antenna, an electromagnetic field is created that then is able to propagate through space.
Wi-Fi is supported by many applications and devices including video game consoles, home networks, PDAs,mobile phones, major operating systems, and other types of consumer electronics. Any products that are tested and approved as "Wi-Fi Certified" (a registered trademark) by the Wi-Fi Alliance are certified as interoperable with each other, even if they are from different manufacturers.
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source : http://www.webopedia.com/TERM/W/Wi_Fi.html
http://mobileoffice.about.com/od/glossary/g/wi-fi.htm
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