What happens when you type a web address and press Enter
Routers: how a packet crosses the internet with no map of the whole road
A message from your phone passes through many machines on its way to a website. Not one of those machines knows the whole road. Yet the message arrives.
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Before the request itself, your phone sends the server one short first message, a knock on the door. Like everything on the internet, it travels as a packet: a small message with a "to" line and a "from" line.
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The first machine on the way is a router: every machine on the way you met before has this name. Its whole job is to pass packets on, and it decides in an instant.
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