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Wi-Fi most commonly uses the 2.4 gigahertz (120 mm) UHF and 5 gigahertz (60 mm) SHF radio bands these bands are subdivided into multiple channels. Different versions of Wi-Fi are specified by various IEEE 802.11 protocol standards, with different radio technologies determining radio bands, maximum ranges, and speeds that may be achieved. Compatible devices can network through wireless access points with each other as well as with wired devices and the Internet. Wi-Fi uses multiple parts of the IEEE 802 protocol family and is designed to work seamlessly with its wired sibling, Ethernet. As of 2019, over 3.05 billion Wi-Fi-enabled devices are shipped globally each year. As of 2017, the Wi-Fi Alliance consisted of more than 800 companies from around the world. Wi-Fi is a trademark of the Wi-Fi Alliance, which restricts the use of the term ' Wi-Fi Certified' to products that successfully complete interoperability certification testing. These are the most widely used computer networks, used globally in home and small office networks to link devices and to provide Internet access with wireless routers and wireless access points in public places such as coffee shops, hotels, libraries, and airports to provide visitors.

Wi-Fi ( / ˈ w aɪ f aɪ/) is a family of wireless network protocols based on the IEEE 802.11 family of standards, which are commonly used for local area networking of devices and Internet access, allowing nearby digital devices to exchange data by radio waves.

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