A Content Distribution Network (CDN) is a system of distributed servers that deliver web content to users based on their geographic location. By caching content closer to users, CDNs reduce latency and improve load times for websites and applications. This is especially important for media-rich content like videos and images. CDNs also enhance website reliability and security by distributing traffic across multiple servers. If one server fails, others can take over, ensuring continuous access. Additionally, CDNs can help mitigate DDoS attacks by absorbing excess traffic, making them a vital component of modern web infrastructure.