How does Wi-Fi work?

Wi-Fi is so woven into daily life that we rarely think about it. We connect phones, laptops, and televisions to the internet with no cables at all, often without a second thought. But this everyday magic raises a real question: if there are no wires, how does the information actually travel between your device and the internet? The answer lies in something invisible all around us.

Wi-Fi works using radio waves. Radio waves are a type of invisible energy that can travel through the air, and they have been used for a long time to carry information, for example in radio broadcasts and television. Wi-Fi uses the same basic idea. Instead of sending data along a physical cable, it encodes that data onto radio waves and sends it through the air. Your device and your router both contain small radios that can send and receive these waves.

At the center of a home Wi-Fi setup is the router. The router is connected to the internet, usually through a physical cable coming into the building. Its job is to act as a translator and a hub. When data arrives from the internet, the router converts it into radio waves and broadcasts them. Your device picks up these waves and turns them back into usable data. When you send something, the process runs in reverse, and the router passes your data on to the internet.

So using Wi-Fi is really a constant two-way conversation in radio waves between your device and the router. Computers handle information as a code of ones and zeros, and Wi-Fi carries this code back and forth on the waves. Because radio waves weaken with distance and can be blocked by walls, Wi-Fi works best within a limited range of the router. Move too far away, and the signal becomes too weak to carry the conversation reliably.

This article was written using information from Wikipedia.