A CDN (Content Delivery Network) is a distributed network of servers that work together to provide fast and reliable delivery of internet content, such as images, videos, web pages, and other media, to end-users. By caching website resources in multiple locations around the world, closer to where users are accessing them, CDNs help reduce latency and improve website performance.

When a user requests content from a website, the request is routed to the nearest server in the CDN that has a cached copy of the requested content. This reduces the distance that data needs to travel, thus reducing the time it takes for the content to load. Additionally, because the data is stored on multiple servers, if one server goes down or experiences high traffic, the CDN can automatically route the request to another server with available capacity, ensuring that the user's experience remains smooth and uninterrupted.

CDNs are commonly used by large websites and online services that serve users around the world, helping to ensure that all users have a fast and reliable experience regardless of their location. Some CDNs also offer additional security features, such as DDoS protection and SSL/TLS encryption, to help protect websites against malicious attacks. Overall, CDNs are an important tool for improving website performance and providing a high-quality user experience.

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