Websites
Content Delivery Network (CDN)
The short answer
A CDN is a network of servers spread across many physical locations that stores copies of your site's files, so visitors load them from a server near them instead of one far away.
Full explanation
Using a CDN typically improves both Time to First Byte and Largest Contentful Paint, since the physical distance data has to travel is one of the biggest factors in how fast a page feels.
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