Wi-Fi
Also known as: WiFi, wifi, wireless internet, wireless LAN, WLAN, 802.11
Wi-Fi is a family of wireless networking standards that lets devices such as phones, laptops, TVs, and smart speakers connect to a local network and the internet without cables, using radio signals from a router or access point.
It's based on the IEEE 802.11 standards and is certified by the Wi-Fi Alliance. While Wi-Fi feels like 'the internet' to most people, it's really just the last few metres of the connection, and slow Wi-Fi is often mistaken for a slow internet plan.
Wi-Fi, explained at three levels
At home
Wi-Fi works like a pair of walkie-talkies. Your router is one walkie-talkie, plugged into your internet connection, and each phone or laptop is another. They take turns sending messages over invisible radio waves, and the router passes those messages to and from the internet. Like walkie-talkies, the signal fades with distance and through walls, which is why Wi-Fi is strongest near the router.
At work
Wi-Fi is a set of wireless networking standards, called IEEE 802.11, that connect devices to a local network using radio instead of cables. In an office, access points mounted on ceilings or walls broadcast the network, and laptops, phones, printers, and card terminals join it. Businesses care because Wi-Fi lets people work anywhere in the building, but its speed, coverage, and security all depend on how it is designed.
At home
Wi-Fi sends data over three radio bands. The 2.4 GHz band uses longer waves that pass through walls well, but it has few channels and shares space with microwaves and Bluetooth. The 5 GHz band offers more and wider channels, so it is faster but fades sooner. The 6 GHz band, added with Wi-Fi 6E, is the widest and least crowded but has the shortest reach. Only one device can transmit on a channel at a time.
At work
A business Wi-Fi network is built from several access points, usually managed by a central controller or cloud dashboard that sets channels, power levels, and settings for all of them. Each network name, or SSID, can map to a separate VLAN, so staff, guest, and device traffic stay apart. Security comes from WPA2 or WPA3: smaller offices use a shared passphrase, while WPA3-Enterprise gives each person their own login through 802.1X and a RADIUS server.
At home
Wi-Fi is a shared medium. Only one device can talk on a channel at a time, so devices listen first and wait their turn, and every device, including a neighbour's router on the same channel, eats into that airtime. Speed also drops with distance, because the router switches to slower, sturdier ways of encoding data as the signal weakens. While a faster internet plan sounds like the fix for buffering, in my view the Wi-Fi link inside your home is the bottleneck far more often.
At work
Enterprise Wi-Fi design starts with capacity, not just coverage. Engineers run predictive or on-site surveys, plan channels so neighbouring access points do not share airtime, and set transmit power so devices roam to a closer access point instead of clinging to a distant one. Standards such as 802.11k, v, and r speed up roaming. Common failures are co-channel interference, too few access points for dense rooms, and legacy devices dragging down speeds. ISED opened the 6 GHz band for licence-exempt use in Canada in 2021.
Real-world examples
At home
Lena's video calls kept freezing in her basement office in Winnipeg. Her internet plan was fast, but the Wi-Fi signal from the upstairs router was too weak through the floor.
At work
Thomas manages IT for a dental clinic in Halifax. He set up separate Wi-Fi networks for staff, patients, and medical devices, so a guest's infected phone can't reach patient records.
How it compares
| feature | Wi-Fi | Ethernet |
|---|---|---|
| Connection | Wireless radio | Physical cable |
| Speed and stability | Varies with distance and interference | Consistent |
| Convenience | Move freely | Tied to a port |
| Security | Needs strong encryption | Requires physical access |
Wi-Fi wins on convenience. Ethernet wins on reliability.
For analysts
Before upgrading an internet plan, I'd check whether Wi-Fi coverage is the real bottleneck. Many 'slow internet' complaints are fixed with better access point placement.
History & origin
The US Federal Communications Commission opened unlicensed spectrum bands for public use in 1985, paving the way for wireless networking. The IEEE published the first 802.11 standard in 1997, offering 2 megabits per second. The name 'Wi-Fi' was created by the branding firm Interbrand in 1999 for the industry group that became the Wi-Fi Alliance; despite popular belief, it doesn't stand for 'wireless fidelity.' Apple's AirPort in 1999 helped bring Wi-Fi to consumer laptops, and Intel's Centrino platform made it standard in 2003. Speeds climbed with each generation, and in 2018 the Wi-Fi Alliance introduced simple names such as Wi-Fi 5 and Wi-Fi 6. In my view, Wi-Fi is one of the most successful technology standards ever, so ordinary that we only notice it when it fails.