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A global network that serves files or cached pages from locations near users.
CDNs reduce latency by moving assets and cached responses closer to the visitor. They are important for images, scripts, static pages, and edge delivery.
Plainly
Think of CDN as roads and power for the app city. A global network that serves files or cached pages from locations near users.
In practice
Use it when local behavior needs to become a reachable, reliable deployed service. In practice, define the owner, input, output, and failure mode before you rely on it.