Content Delivery Networks (CDNs) enhance web performance by distributing content across multiple geographically dispersed servers. This setup allows users to access data from servers closer to their location, reducing latency and improving loading times for websites and applications. CDNs are particularly effective for handling high traffic volumes and providing a reliable user experience. They also help in managing bandwidth usage and can offer enhanced security features, such as DDoS protection. Overall, CDNs play a crucial role in ensuring fast, reliable web access.