Wi-Fi

WiFiwireless internetwirelessdual-band Wi-Fiwireless Internet accesswireless internet connectionWi-Fi connectionWi-Fi networkwireless accessWi-Fi 802.11 b/g/n
Wi-Fi is technology for radio wireless local area networking of devices based on the IEEE 802.11 standards.wikipedia
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Wi-Fi Alliance

Wi-Fi EasyMeshWireless Ethernet Compatibility Alliance
WiFi 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.
Wi-Fi Alliance is a non-profit organization that promotes Wi-Fi technology and certifies Wi-Fi products for conformity to certain standards of interoperability.

IEEE 802.11

802.11802.11b/g/n802.11b/g
Wi-Fi is technology for radio wireless local area networking of devices based on the IEEE 802.11 standards.
IEEE 802.11 is part of the IEEE 802 set of LAN protocols, and specifies the set of media access control (MAC) and physical layer (PHY) protocols for implementing wireless local area network (WLAN) Wi-Fi computer communication in various frequencies, including but not limited to 2.4, 5, and 60 GHz frequency bands.

Hotspot (Wi-Fi)

hotspotWi-Fi hotspothotspots
Such an access point (or hotspot) has a range of about 20 m indoors and a greater range outdoors.
A hotspot is a physical location where people may obtain Internet access, typically using Wi-Fi technology, via a wireless local area network (WLAN) using a router connected to an internet service provider.

Wireless access point

access pointaccess pointsWAP
Wi-Fi compatible devices can connect to the Internet via a WLAN and a wireless access point.
In computer networking, a wireless access point (WAP), or more generally just access point (AP), is a networking hardware device that allows other Wi-Fi devices to connect to a wired network.

Smartphone

smartphonessmart phonesmart phones
Devices that can use Wi-Fi technologies include desktops and laptops, video game consoles, smartphones and tablets, smart TVs, digital audio players, cars and modern printers.
Smartphones typically include various sensors that can be leveraged by their software, such as a magnetometer, proximity sensors, barometer, gyroscope and accelerometer, and support wireless communications protocols such as Bluetooth, Wi-Fi, and satellite navigation.

Wireless LAN

WLANwireless local area networkwireless
Wi-Fi is technology for radio wireless local area networking of devices based on the IEEE 802.11 standards. This includes wireless local area network (WLAN) connections, device to device connectivity (such as Wi-Fi Peer to Peer aka Wi-Fi Direct), Personal area network (PAN), local area network (LAN) and even some limited wide area network (WAN) connections.
Most modern WLANs are based on IEEE 802.11 standards and are marketed under the Wi-Fi brand name.

Ultra high frequency

UHFUHF bandUHF radio
Wi-Fi most commonly uses the 2.4 GHz UHF and 5.8 GHz SHF ISM radio bands; these bands are subdivided into multiple channels.
They are used for television broadcasting, cell phones, satellite communication including GPS, personal radio services including Wi-Fi and Bluetooth, walkie-talkies, cordless phones, and numerous other applications.

CSIRO

Council for Scientific and Industrial ResearchCSIRCommonwealth Scientific and Industrial Research Organisation
The Australian radio-astronomer Dr John O'Sullivan with his colleagues Terence Percival, Graham Daniels, Diet Ostry, and John Deane developed a key patent used in Wi-Fi as a by-product of a Commonwealth Scientific and Industrial Research Organisation (CSIRO) research project, "a failed experiment to detect exploding mini black holes the size of an atomic particle".
Notable developments by CSIRO have included the invention of atomic absorption spectroscopy, essential components of Wi-Fi technology, development of the first commercially successful polymer banknote, the invention of the insect repellent in Aerogard and the introduction of a series of biological controls into Australia, such as the introduction of myxomatosis and rabbit calicivirus for the control of rabbit populations.

ISM band

ISM2.4 GHz13.56 MHz
Wi-Fi most commonly uses the 2.4 GHz UHF and 5.8 GHz SHF ISM radio bands; these bands are subdivided into multiple channels.
Cordless phones, Bluetooth devices, near field communication (NFC) devices, garage door openers, baby monitors and wireless computer networks (WiFi) all may use the ISM frequencies, although these low power emitters are not considered ISM.

WaveLAN

Classic WaveLAN
In 1991, NCR Corporation with AT&T Corporation invented the precursor to 802.11, intended for use in cashier systems, under the name WaveLAN.
This led to the founding of the 802.11 Wireless LAN Working Committee which produced the original IEEE 802.11 standard, which eventually became known popularly as Wi-Fi. When NCR was acquired by AT&T in 1991, becoming the AT&T GIS (Global Information Solutions) business unit, the product name was retained, as happened two years later when the product was transferred to the AT&T GBCS (Global Business Communications Systems) business unit, and again when AT&T spun off their GBCS business unit as Lucent in 1995.

Ethernet

wiredJabbernetworking
ALOHAnet and the ALOHA protocol were early forerunners to Ethernet, and later the IEEE 802.11 protocols, respectively.
The primary alternative for some uses of contemporary LANs is Wi-Fi, a wireless protocol standardized as IEEE 802.11.

ALOHAnet

Alohaslotted ALOHAALOHA network
ALOHAnet and the ALOHA protocol were early forerunners to Ethernet, and later the IEEE 802.11 protocols, respectively. In 1971, ALOHAnet connected the Hawaiian Islands with a UHF wireless packet network.
In the early 1980s frequencies for mobile networks became available, and in 1985 frequencies suitable for what became known as Wi-Fi were allocated in the US.

Wi-Fi Direct

DirectDirect Wi-FiWiFi Direct network
This includes wireless local area network (WLAN) connections, device to device connectivity (such as Wi-Fi Peer to Peer aka Wi-Fi Direct), Personal area network (PAN), local area network (LAN) and even some limited wide area network (WAN) connections.
Wi-Fi Direct, initially called Wi-Fi P2P, is a Wi-Fi standard enabling devices to easily connect with each other without requiring a wireless access point.

Local area network

LANlocal networklocal
This includes wireless local area network (WLAN) connections, device to device connectivity (such as Wi-Fi Peer to Peer aka Wi-Fi Direct), Personal area network (PAN), local area network (LAN) and even some limited wide area network (WAN) connections.
Ethernet and Wi-Fi are the two most common technologies in use for local area networks.

IEEE 802.11ac

802.11acac11ac
Many newer consumer devices support the latest 802.11ac standard, which uses the 5 GHz band exclusively and is capable of multi-station WLAN throughput of at least 1 gigabit per second, and a single station throughput of at least 500 Mbit/s.
IEEE 802.11ac is a wireless networking standard in the 802.11 family (which is marketed under the brand name Wi-Fi), developed in the IEEE Standards Association, providing high-throughput wireless local area networks (WLANs) on the 5 GHz band.

Wireless

wireless communicationwireless communicationswireless internet
The non-profit Wi-Fi Alliance was formed in 1999 to fill this void — to establish and enforce standards for interoperability and backward compatibility, and to promote wireless local-area-network technology.
This became its primary usage in the 2000s, due to the advent of technologies such as mobile broadband, Wi-Fi and Bluetooth.

IEEE 802.11n-2009

n802.11n802.11b/g/n
As the first Wi-Fi standard that introduced MIMO (Multiple-Input and Multiple-Output) support, sometimes devices/systems that support 802.11n standard (or draft version of the standard) are being referred to as MIMO (Wi-Fi products), especially before the introduction of the next generation standard.

Wireless network interface controller

wireless cardmac80211wireless network interface card
Anyone within range with a wireless network interface controller can attempt to access a network; because of this, Wi-Fi is more vulnerable to attack (called eavesdropping) than wired networks.
The low cost and ubiquity of the Wi-Fi standard means that many newer mobile computers have a wireless network interface built into the motherboard.

IPhone

iPhonesiPhone appApple iPhone
Many smartphones have a built-in capability of this sort, including those based on Android, BlackBerry, Bada, iOS (iPhone), Windows Phone and Symbian, though carriers often disable the feature, or charge a separate fee to enable it, especially for customers with unlimited data plans.
The iPhone has Wi-Fi and can connect to cellular networks.

John O'Sullivan (engineer)

John O'SullivanJohn O’Sullivan
The Australian radio-astronomer Dr John O'Sullivan with his colleagues Terence Percival, Graham Daniels, Diet Ostry, and John Deane developed a key patent used in Wi-Fi as a by-product of a Commonwealth Scientific and Industrial Research Organisation (CSIRO) research project, "a failed experiment to detect exploding mini black holes the size of an atomic particle".
This technology was patented by CSIRO and forms part of the 802.11a, 802.11g and 802.11n Wi-Fi standards and thus O'Sullivan is also credited with the invention of WIFI.

Super Wi-Fi

The Wi-Fi Alliance may or may not sanction derivative terms, such as Super Wi-Fi, coined by the US Federal Communications Commission (FCC) to describe proposed networking in the UHF TV band in the US.
The use of the trademark "Wi-Fi" in the name has been criticized because it is not based on Wi-Fi technology or endorsed by the Wi-Fi Alliance.

Tethering

mobile hotspottetherTethered
When subscribed to a cellular data carrier, they allow nearby Wi-Fi stations to access the Internet over 2G, 3G, or 4G networks using the tethering technique.
Connection of a mobile device with other devices can be done over wireless LAN (Wi-Fi), over Bluetooth or by physical connection using a cable, for example through USB.

Wide area network

WANWANswide area networks
This includes wireless local area network (WLAN) connections, device to device connectivity (such as Wi-Fi Peer to Peer aka Wi-Fi Direct), Personal area network (PAN), local area network (LAN) and even some limited wide area network (WAN) connections.
This distinction stems from the fact that common LAN technologies operating at lower layers of the OSI model (such as the forms of Ethernet or Wi-Fi) are often designed for physically proximal networks, and thus cannot transmit data over tens, hundreds, or even thousands of miles or kilometres.

Wireless network

wireless networkingwirelesswireless networks
Wi-Fi technology may be used to provide Internet access to devices that are within the range of a wireless network that is connected to the Internet.
June 1997 802.11 "Wi-Fi" protocol first release

Laptop

laptop computerlaptopsnotebook computer
Devices that can use Wi-Fi technologies include desktops and laptops, video game consoles, smartphones and tablets, smart TVs, digital audio players, cars and modern printers.
Although being common until the end of the 2000s decade, Ethernet network port are rarely found on modern laptops, due to widespread use of wireless networking, such as Wi-Fi.