Content Delivery Network (CDN)

A content delivery network (CDN) is a distributed network of servers that helps optimize the delivery of website assets like HTML pages, images, videos, files, and other media over the internet.

Key CDN facts:

  • Improves website load speeds by distributing content globally so it loads faster for users based on geographical proximity.
  • Reduces bandwidth costs and improves infrastructure scalability for site owners.
  • Enhances security by mitigating DDoS attacks and bot threats through caching.
  • Provides consistently fast delivery of static, cacheable content by minimizing physical distance to users.
  • Major CDNs include Cloudflare, Akamai, Amazon CloudFront, and Google Cloud CDN.
  • CDNs cache copies of content at data centers around the world called Points of Presence (POPs).
  • When a user requests a page, assets are served from the nearest CDN edge server for faster performance.
  • Useful for handling spikes in traffic and demand smoothly.
  • Vital for delivering modern web experiences and supporting SEO through fast site speeds.

Using a CDN to optimize and distribute content globally is an impactful web performance best practice for UX, traffic capacity, security, and SEO.