A CDN, or Content Delivery Network, is a system of distributed servers that work together to deliver web content to users more efficiently. When you visit a website, the CDN helps load images, videos, and other files from a server that is geographically closer to you. This reduces loading times and improves the overall experience, especially for users far from the original server. By using a CDN, websites can handle more traffic and reduce the risk of crashing during peak times. Additionally, CDNs often provide security features, such as protection against DDoS attacks, making them a valuable tool for website owners looking to enhance performance and safety.