History of the Internet
A Short History of Wi-Fi
Wi-Fi is so ubiquitous that we notice it only when it fails. But wireless networking was a hard-won technology with a surprisingly tangled origin.
From radio to data
Sending data over radio waves is an old idea, but doing it reliably in a crowded home or office is hard. Signals reflect off walls, interfere with each other, and fade with distance. The foundations for solving these problems drew on decades of radio engineering, including spread-spectrum techniques.
The 802.11 standards
In 1997 the IEEE published the first version of the 802.11 standard for wireless local networks. Successive versions steadily improved speed and reliability — 802.11b, then a, g, n, ac, and the generations now marketed as Wi-Fi 5, 6, and beyond. Each brought faster data rates, better handling of many devices at once, and improvements in range.
Why "Wi-Fi"?
The term "Wi-Fi" is a brand created by an industry group to certify that devices interoperate. It is often assumed to stand for "Wireless Fidelity," but that phrase was essentially a marketing afterthought — the name was chosen because it sounded catchy and echoed "Hi-Fi." What matters is the certification: a "Wi-Fi Certified" logo means gear from different makers will work together.
How Wi-Fi relates to your IP address
Wi-Fi connects your device to your local network — your home router. On that local network your device has a private IP address (often something like 192.168.x.x). Your router then shares one public IP address with everything in the house using Network Address Translation. So Wi-Fi is the last hop; the public IP that the wider internet sees is assigned by your ISP, not by Wi-Fi itself.
Security matters
Because Wi-Fi broadcasts through the air, encryption is essential. Standards evolved from the weak, long-broken WEP to WPA and today's WPA2 and WPA3. Using a modern encryption standard and a strong password is the single most important thing you can do to keep a home wireless network private.