One undersea cable carries more internet traffic than all satellites combined. But how is that possible? Because satellites are really far away, tens of thousands of kilometers, which means limited bandwidth and higher latency. Undersea cables? They’re right on the ocean floor, built from fiber-optic glass strands that send data as pulses of light. But how does light carry the internet? Each light pulse represents digital information, 1s and 0s , and travels through the glass at almost the speed of light. And here’s the really interesting part: they use wavelength-division multiplexing to split that light into dozens of colors, each carrying its own data stream. Think of it like turning one highway into dozens of invisible lanes. So why not just use satellites for everything? Because one modern cable can move hundreds of terabits per second, enough to handle the internet needs of entire countries, while satellites can’t get close to that without massive delays. Right now, 95% of all gl...