How does the internet work, and why do we need wi-fi to use it?
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You don’t need WiFi to use it. For about the first two decades of the internet, WiFi wasn’t a thing. You used physical wires (often telephone wires in the early days).
The internet is an agreed system of rules for computer networks to talk to each other. So a computer on one network (say, your home WiFi or your work network or your ISP) can find and talk to any other computer on any other network that’s also connected to the internet.
It’s not really “one thing” any more than “how do roads work”…there’s roads all over the world, built and maintained by different people, connected in different ways, but as long as we all agree on some basic rules then cars can use all of them and you can get between any two points connected by road (with the right map and cars).
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