What is CDN (Content Delivery Network)?
A global network of servers that delivers your website's static files from the location closest to each visitor.
A CDN caches your HTML, CSS, JavaScript, and images across servers worldwide. When a user in Tokyo visits your site, they get files from a nearby server instead of your origin in Virginia. This reduces latency (faster LCP), improves availability, and reduces origin server load. Vercel, Cloudflare, and AWS CloudFront are common CDNs for Next.js apps.