## TL;DR

A CDN is a geographically distributed network of edge servers that cache and serve content from locations closest to users, reducing latency and origin server load. Major CDNs: Cloudflare, Akamai, Fastly, Amazon CloudFront. CDNs handle ~75% of all web traffic.

## Core Explanation

CDN features: DDoS protection, SSL/TLS termination, WAF, image optimization, edge computing (Cloudflare Workers, AWS Lambda@Edge). Cache strategies: push (upload content) vs. pull (cache on first request). Anycast routing directs users to the nearest PoP. CDN edge locations: Cloudflare 330+ cities, CloudFront 600+ PoPs.

## Further Reading

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