Wi-Fi, a trademarked name, is a method of wireless connectivity that travels over radio waves.
The nonprofit Wi-Fi Alliance certifies products as Wi-Fi after determining they will work with all the other certified products. Wi-Fi has been given permission to use the 2.4GHz or 5GHz bands.
There have been four generations of Wi-Fi products as of March 2010. Each generation is defined by features that relate to performance, frequency and bandwidth, according to the alliance. And each generation advances security.
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