What is a content delivery network (CDN)? - Cloudflare
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https://www.cloudflare.com/learning/cdn/what-is-a-cdn/
A content delivery network (CDN) is a geographically distributed group of servers that caches content close to end users. A CDN allows for the quick transfer of assets needed for loading Internet content, including HTML pages, JavaScript files, stylesheets, images, and videos...