what is wifi

2006-12-25 13:04:24,from:WOW

Short for wireless fidelity and is A logo from the Wi-Fi Alliance that certifies network devices comply with the IEEE 802.11 wireless Ethernet standard. In the early 2000s, Wi-Fi/802.11 became widely used, and within a short time, all laptops and other handheld devices came with Wi-Fi built in. Earlier laptops could be Wi-Fi enabled by plugging in a Wi-Fi PC Card.

Any products 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. A user with a "Wi-Fi Certified" product can use any brand of access point with any other brand of client hardware that also is certified. Typically, however, any Wi-Fi product using the same radio frequency (for example, 2.4GHz for 802.11b or 11g, 5GHz for 802.11a) will work with any other, even if not "Wi-Fi Certified."

Formerly, the term "Wi-Fi" was used only in place of the 2.4GHz 802.11b standard, in the same way that "Ethernet" is used in place of IEEE 802.3. The Alliance expanded the generic use of the term in an attempt to stop confusion about wireless LAN interoperability.

what is wifi

what is wifi,