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Wi-Fi is a way of accessing the internet without using wires.
There are many different type of WI-FI ( IEEE 802.11 ) standards, some of the more commonly know ones are Wireless A,B,G,N and now the newly suggested AC & AD. The major difference between these standards is the distance which devices can connect to the access points and the speed (Bandwidth) at which these devices can go.
As of 2013, most wireless networks use one of two frequency bands. These are not the only two bands, but probably those used most widely, by common users. One of the bands is at around 2.4 Ghz, and the other is at 5 Ghz. Both of these have benefits and drawbacks: The 2.4 Ghz band is widely used, and devices are usually cheaper. The may problem is that only three or four devices can be used at the same time, without their communication interfering. Another problem is that microvave ovens, baby phones, DECT telephones and other wireless devices mostly use the 2.4 Ghz band. Using the 5 Ghz band increases the number of devices to around 19, but there are more rules for using it. In some places, the 5 Ghz band may not be used outdoors. Because less devices use the 5 Ghz band, devices that do are often more expensive.
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- Q&A: Wi-fi health concerns, BBC News