How Websites Work
What actually happens between typing an address and seeing a page — DNS, servers, HTML, and the round trip in between.
Beginner8 min readDaksh BathlaDEFINITIONDevelopment
CDN
Content Delivery Network
A network of servers in many locations that keeps copies of your files, so a visitor is served from somewhere physically near them instead of from one origin server.
EXAMPLE
A reader in Mumbai and a reader in Berlin both load your site's images from a server in their own region, rather than both waiting on one machine.
WHY IT MATTERS
Distance costs time, and it's the part of page speed you can fix without changing any code. Most modern hosts include one by default.