CDN

Summary

A Content Delivery Network is a distributed set of servers that serve static assets (images, CSS, JS) from a location physically closer to the user for speed. Edge caching reduces the distance data must travel, while CDNs can also provide TLS termination, compression, request routing, image optimization, and protection against traffic spikes.

• 1Check which CDN a favorite site uses via response headers (e.g. `x-served-by`). Validate your understanding by applying it in a small practical example.
• 2Learn why CDNs dramatically reduce latency for global audiences. Focus on understanding the underlying reason it works, not only memorizing the definition.
• 3Understand the difference between origin server and edge server.