How does WiFi work?
WiFi transmits data using radio waves at 2.4 GHz or 5 GHz frequencies between your router and devices, converting internet data into wireless signals and back.
Full answer ¶
A WiFi router receives internet data through a physical cable (from your ISP), then converts it into radio wave signals. These signals radiate outward in all directions — your phone, laptop, or smart TV has a wireless adapter that catches them.
The two main frequencies are 2.4 GHz and 5 GHz. The 2.4 GHz band travels farther and penetrates walls better but is slower and more congested. The 5 GHz band is faster but has a shorter range — most modern routers broadcast both simultaneously (dual-band).
When your device sends a request — say, loading a webpage — it transmits a radio signal back to the router. The router forwards that request through the cable to the internet, fetches the data, and sends it back wirelessly in milliseconds.
WiFi standards (802.11a/b/g/n/ac/ax) define the speed and range of each generation. WiFi 6 (802.11ax) is the current mainstream standard, handling more simultaneous devices with less interference than older versions.
More in Science & Nature
Key facts ¶
| 2.4 GHz max speed | ~600 Mbps (theoretical) |
| 5 GHz max speed | ~3.5 Gbps (theoretical) |
| Current standard | WiFi 6 (802.11ax) |
| Wall penetration | 2.4 GHz better than 5 GHz |
| Signal type | Radio waves (non-ionizing) |
Common mistake ¶
Most people assume a faster router automatically means faster internet — your actual speed is capped by your ISP plan, not the router's theoretical maximum.
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