Simple definition
A network of distributed servers that brings the web content closer to visitors.
Technical definition
Content Delivery Network caches or relays resources from geographically distributed locations.
What is it used for ?
Reduce latency, absorb traffic and sometimes provide additional protection.
Practical example
Images of a site can be served from a node CDN close to the user rather than from the original server.
Common issues
- Cache serving an old version
- DNS misconfigured
- Origin exposed despite the CDN
Related terms
Key takeaway: This entry explains the general operation of the term. Exact settings may vary depending on software, vendors and environments.