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, across various locations, a CDN reduces the distance data must travel. This results in faster loading times and improved performance for websites. CDNs are particularly useful for high-traffic sites and streaming services, as they can handle large volumes of requests simultaneously. Popular CDN providers include Akamai, Cloudflare, and Amazon CloudFront, which help businesses enhance user experience and reduce server load.