A content delivery network or content distribution network (CDN) is a system of computers networked together across the Internet that cooperate transparently to forward stage content closer to end users, most often for the purposes of improving performance and scalability,.

For instance, when there is a 10 Gbit/s network backbone and 100 Gbit/s central server capacity, only 10 Gbit/s can be delivered. But when 10 servers are moved to 10 edge locations, total capacity can be 10*10 Gbit/s.

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