Wi-Fi is the technology that lets phones, laptops and smart devices connect to a local network — and usually the internet — using radio waves instead of cables. The name is a brand coined by the Wi-Fi Alliance; the underlying standards come from the IEEE 802.11 family.
Radio conversations
A Wi-Fi router (or access point) and your device hold a rapid two-way radio conversation. Your device converts the data it wants to send into radio signals, the router receives and forwards them onto the wired network, and the process reverses for incoming data. It all happens far faster than human perception.
Frequencies and bands
Wi-Fi operates mainly in unlicensed radio bands. The 2.4 GHz band travels farther and passes through walls better but is slower and more crowded; the 5 GHz band is faster over short distances; newer standards add 6 GHz for even more capacity. Your router and device negotiate the best available option automatically.
Standards keep improving
Wi-Fi generations are now marketed with simple numbers: Wi-Fi 5, Wi-Fi 6, Wi-Fi 6E and Wi-Fi 7. Each generation improves speed, efficiency and the ability to serve many devices at once — important as homes fill with phones, TVs, speakers and smart gadgets competing for airtime.
Why Wi-Fi slows down
Common culprits include distance and walls between you and the router, interference from neighbours' networks or household devices, too many devices sharing the connection, and an internet plan slower than your needs. Fixes usually start with router placement — central, elevated and in the open — before considering upgrades or mesh systems.