This post is about content delivery network. I'll keep it short and explain it in the simplest possible way I can. Normally when you open a website, your request has to travel to the server where the web pages are located. It then fetches these pages and returns them to you. It's perfectly fine when the distance between you and server is less, but when the server is located at the other end of the globe it may take a while for the page to load. This means people closer to the server can access the site faster while the ones away from it will have a low load page speed. To fix this we have something called CDN meaning Content Delivery Network. This means we have a network of servers around the world and the original file is cached on each of these servers, by cache I mean a copy of it is saved on every other server. If a site is using CDN it will be accessible on the same speed to everyone regardless of how they are located geographically. For example, YouTube has its own content delivery network that's why it's so fast for all of us. Netflix also uses CDN and it uses an algorithm to push the most viewed shows on all of its servers, that's why popular shows load faster while others load slower. So that's what you need to know about CDN.