Light in a fiber cable is fast, but it isn't instant. If a website lives on one server in Virginia and you're loading it from Sydney, every request has to cross an ocean and come back. A modern page might need dozens of files (images, scripts, fonts, stylesheets), and all those round trips add up to a page that feels sluggish even on a great connection. You can't make the planet smaller. What you can do is move the files closer to the people asking for them. That's what a CDN is. Content delivery network. It's a company that runs a lot of servers in a lot of cities (they call them edge…
Why Websites Keep Copies of Themselves All Over the World
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