A Content Delivery Network (CDN) is a system of distributed servers strategically placed around the world to deliver web content - such as images, videos, and webpages - quickly and efficiently to users. By storing copies of content closer to where users are located, CDNs reduce the distance data must travel, resulting in faster load times and improved website reliability. CDNs also help manage high traffic loads and protect against certain cyber threats, such as Distributed Denial of Service (DDoS) attacks, by distributing network traffic across multiple servers. This makes them essential for websites and online services that need to provide fast, secure, and reliable access to content for users everywhere.