An SSL CDN (Secure Sockets Layer Content Delivery Network) combines the security features of SSL with the performance benefits of a CDN. A CDN is a network of servers strategically distributed worldwide to deliver web content more efficiently to users based on their geographic location. When combined with SSL, the CDN ensures that this content is delivered over a secure, encrypted connection. This setup is crucial for improving website load times while maintaining data security, particularly important for e-commerce sites and any website handling sensitive user information.