System Design Fundamentals | Pt 7 | CDN

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A Content Delivery Network (CDN) is a distributed network of servers that are designed to deliver content, such as web pages, images, videos, and other multimedia, to users around the world. CDNs work by caching and delivering content from the server that is geographically closest to the user, which can significantly reduce latency and improve the user experience.

When a user requests content from a website, the request is directed to the nearest server in the CDN, which can deliver the content more quickly than a server located farther away. This can result in faster load times, reduced latency, and improved reliability of the content delivery.

CDNs can provide several benefits, including:

1. Faster load times: CDNs can reduce the time required to load content by delivering it from the server closest to the user.

2. Improved reliability: CDNs can improve the reliability of content delivery by distributing the content across multiple servers, which reduces the risk of a single point of failure.

3. Reduced bandwidth costs: CDNs can help reduce the bandwidth costs associated with delivering content by caching and delivering content from servers located closer to the user.

4. Improved scalability: CDNs can help improve the scalability of websites and web applications by distributing the load across multiple servers, which can handle increased traffic more effectively.

5. Improved security: CDNs can provide additional security features, such as DDoS protection and SSL encryption, which can help protect websites and web applications from attacks.

Overall, CDNs are an important tool for improving the performance and reliability of content delivery over the internet, and are commonly used by websites and web applications of all sizes.