tech
Popular websites and streaming services keep copies of their content on many servers spread across the world, close to where users actually live.
A CDN stores copies of the same video, image, or page on many servers worldwide, so a request is served from the nearest one rather than traveling from the original source. This cuts loading time by shortening physical distance and reduces strain on the origin server, since nearby cached copies handle most requests.
Content deletion network has no real meaning, and a central data node is closer to the opposite of a CDN, a single concentrated point rather than distributed servers.
CDNs also absorb sudden traffic surges or attacks by spreading load across many separated servers, which is part of why they're considered essential infrastructure for large websites.
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