A Content Delivery Network (CDN) is a geographically distributed group of servers that work together to provide fast delivery of Internet content. In a WordPress context, a CDN stores static assets like images, CSS files, and JavaScript libraries in "Edge" locations around the world. When a user in Europe accesses your Niagara-based server, the CDN serves the heavy media from a server in London or Paris instead of making the data travel across the Atlantic. This drastically reduces latency and improves the user experience. For high-end developers, a CDN is non-negotiable for enterprise or global sites. Beyond speed, CDNs also provide a layer of security through Web Application Firewalls (WAF) and DDoS protection. Popular solutions like Cloudflare, Bunny.net, or WPEngine's Global Edge Security allow developers to offload significant portions of the server load, ensuring that the primary WordPress instance can focus on processing dynamic PHP requests and database queries. Implementing a CDN is one of the most cost-effective ways to scale a site's performance for a global audience.
Glossary entry