A Content Delivery Network (CDN) is a system of distributed servers that work together to deliver web content to users more efficiently. By storing copies of content, such as images, videos, and web pages, in multiple locations around the world, CDNs reduce the distance data must travel. This helps improve loading times and enhances the overall user experience. CDNs are particularly useful for websites with high traffic or global audiences. They can also provide additional benefits, such as increased security and reliability. Popular CDN providers include Akamai, Cloudflare, and Amazon CloudFront.