|Developed by||Wi-Fi Alliance|
|Compatible hardware||mobile phones, personal computers, gaming consoles|
The Wi-Fi Alliance says Wi-Fi is any "wireless local area network" (WLAN) that follows the Institute of Electrical and Electronics Engineers' (IEEE) 802.11 specification. A Wi-Fi device can work with any Wi-Fi network anywhere in the world.
There are many types of Wi-Fi standards, known as 802.11 a, b, g, n, and recently ac & ad. These specifications are different in terms of speed and how far away you can use them.
As of 2013, most wireless networks use one of two radio 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. Microwave ovens, DECT telephones and other wireless devices also use the 2.4 GHz band, and sometimes cause interference which slows transmissions. The 5 GHz band has more frequencies and usually less interference, but there are more rules for using it. In some places, the 5 GHz band may not be used outdoors. Because fewer devices use the 5 GHz band, devices that do are often more expensive.
The World Health Organization (WHO) says that Wi-Fi is not dangerous.
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Wi-Fi Facts for Kids. Kiddle Encyclopedia.