What is a Content Delivery Network (CDN)?

Often promoted as a benefit or add-on to a hosting package, a content delivery network, also known as a CDN, is a group of servers working together to deliver a cached copy of your content at faster speed across the globe – especially those assets such as large images or video which would otherwise make a site very slow to load. 

According to Cloudflare, one of the better known CDN services:

A content delivery network (CDN) refers to a geographically distributed group of servers which work together to provide fast delivery of Internet content. A CDN allows for the quick transfer of assets needed for loading Internet content including HTML pages, javascript files, stylesheets, images, and videos. The popularity of CDN services continues to grow, and today the majority of web traffic is served through CDNs, including traffic from major sites like Facebook, Netflix, and Amazon.

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