Wi-Fi, Wireless Fidelity, is way to get Internet access and used to define any of the wireless technology in the IEEE 802.11 specification - including (but not necessarily limited to) the wireless protocols 802.11a, 802.11b, and 802.11g.
The Wi-Fi Alliance is the body responsible for promoting the term and its association with various wireless technology standards. is meant to be used generically when referring of any type of 802.11 network.
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.
The Wi-Fi Alliance began as a community aiming to address the needs of consumers by ensuring products from different vendors working well together. The Alliance created the branding "Wi-Fi Certified" to reassure consumers that products will interoperate with other products displaying the same branding.
However, any Wi-Fi product using the same radio frequency (for example, 2.4GHz for 802.11b, 802.11g, 5GHz for 802.11a) will work with any other, even if not "Wi-Fi Certified."
A Wi-Fi enabled device can connect to the Internet when within range of a wireless network connected to the Internet. The coverage of one or more interconnected access points — called a hotspot — can comprise an area as small as a single room with wireless-opaque walls or as large as many square miles covered by overlapping access points.
Wi-Fi also allows connectivity in peer-to-peer (wireless ad-hoc network) mode, which enables devices to connect directly with each other. This connectivity mode can prove useful in consumer electronics and gaming applications.
Wi-Fi technology boasts fast data transfer speeds and range, making it a good replacement for Ethernet (802.3) systems.
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