A CDN, or content delivery network, is a geographically distributed network of servers that stores copies of a website's content, such as images, videos, and web pages, so it can be delivered to visitors from a server physically close to them rather than from one central, potentially distant location.
Without a CDN, every visitor to a website would request content from a single origin server, which can be slow for users located far away and creates a single point that can become overwhelmed during traffic spikes.
Copies of Content, Spread Around the World
Why This Matters for Speed and Reliability
When a CDN is in use, a visitor's request is automatically routed to the nearest available server holding a copy of the requested content, cutting down the physical distance data has to travel and generally improving loading speed noticeably.
Beyond raw speed, CDNs also improve reliability by spreading traffic across many servers rather than one, and they add a layer of protection against certain types of cyberattacks that attempt to overwhelm a website with excessive traffic.
Sources
- Wikipedia β overview of content delivery network architecture and purpose
- Cloudflare β technical explainer on how CDNs function
- Amazon Web Services β industry background on content delivery network use cases
FAQ
What does CDN stand for?
Content delivery network, a geographically distributed system of servers that stores copies of website content closer to visitors.
Why does a CDN make websites load faster?
Because it delivers content from a server physically close to the visitor rather than from one central, potentially distant origin server.
Does a CDN only improve speed?
No β it also improves reliability by spreading traffic across many servers and adds protection against certain traffic-flooding cyberattacks.
About the Author
We reference Wikipedia, Cloudflare, and Amazon Web Services to explain the background and current understanding of this topic.
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