CDN (Content Delivery Network)
A network of global servers that deliver your content from the closest location to each user.
A CDN (content delivery network) is a network of servers that keep copies of your files near your visitors. A request is answered by the nearest node instead of your origin server, which cuts latency, absorbs traffic spikes, and usually improves Time to First Byte more than any application-level optimisation.
Definition
A CDN is a network of geographically distributed servers that cache and deliver content from the nearest location to the user. Popular CDNs include Cloudflare, AWS CloudFront, Fastly, and Bunny.net.
CDNs improve performance (lower latency), security (DDoS protection, WAF), and reliability (load distribution). Cloudflare's free tier offers CDN, SSL, and basic DDoS protection.
Why It Matters
Without a CDN, a user in Lahore connecting to a server in Virginia experiences 200-300ms of latency per request. A CDN with a Karachi PoP reduces this to 10-30ms. Multiply by 50+ requests per page and the difference is dramatic.
Example
SlapMyWeb uses Cloudflare CDN. Static assets (JS, CSS, fonts) are cached at 300+ edge locations worldwide. A user in Dubai gets sub-100ms load times instead of 500ms+ from the origin server.
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