Wi Fi or WiFi is a wireless LAN technology for devices based on IEEE 802.11 standard. Wi？ FI is a trademark of the Wi Fi alliance, which restricts the use of the term "Wi Fi certification" for products that successfully complete interoperability certification tests.

Devices that can use Wi Fi technology include desktops and laptops, video game consoles, smartphones and tablets, smart TVs, digital audio players and modern printers. Wi-Fi compatible devices can connect to the Internet through WLAN and wireless access points. Such access points (or hotspots) range from about 20 meters (66 feet) indoors to more outdoors. The hotspot coverage can be as small as a single room, its walls can block radio waves, or as large as the square kilometers achieved by using multiple overlapping access points.

A device described for printing documents that sends wireless information to another device that is all connected to the local network

Wi Fi most commonly uses the 2.4 GHz (12 cm) UHF and 5.8 GHz (5 cm) SHF ism radio bands, which can be subdivided into multiple channels. Each channel can be used by multiple networks in time-sharing. These wavelengths are best for line of sight. Many common materials absorb or reflect them, which further limits the range, but may help to minimize interference between different networks in congested environments. At close range, some versions of Wi Fi running on the right hardware can reach speeds of more than 1 Gbps.

Anyone in the range with a wireless network interface controller can try to access the network. As a result, Wi Fi is more vulnerable to attack (known as eavesdropping) than wired networks. Wi Fi protected access is a series of technologies that are created to protect information moving in Wi Fi networks, including solutions for personal and enterprise networks. The security features of Wi Fi protection access include more powerful protection functions and new security practices, because the security situation has changed over time.

The name Wi Fi, which was used commercially at least as early as August 1999, was created by Interbrand, a brand consultancy. The Wi Fi alliance has hired Interbrand to create a name for it that is "more attractive than 'IEEE 802.11b direct sequence'. Phil Belanger, a founding member of the Wi Fi alliance who presided over the choice of the name "Wi Fi", said Interbrand invented Wi Fi as a pun on the word "Hi Fi".

Interbrand also created the Wi Fi logo. The Yin Yang Wi Fi logo indicates that the product has interoperability certification.

Within a short time after the brand name was created, the Wi Fi alliance used the meaningless slogan "wireless fidelity standard". However, the name has never been officially called "wireless fidelity.". Nevertheless, the Wi Fi alliance is also known as "wireless fidelity alliance Inc" in some publications, and IEEE's own website has declared that "WiFi is the abbreviation of wireless fidelity".

Non Wi Fi technology for fixed points, such as Motorola canopy, is often described as fixed wireless. Alternative wireless technologies include mobile phone standards such as 2G, 3G, 4G and LTE.

The name is sometimes written as WiFi, WiFi, or WiFi, but not approved by the Wi Fi alliance.