The purpose of a Content Delivery Network (CDN) in web services is to distribute and deliver web content efficiently to users based on their geographical location. CDNs consist of multiple servers located around the world, allowing users to access content from the nearest server, thereby improving load times and performance. This reduces latency and enhances the overall user experience, particularly for multimedia content like videos and images. CDNs also provide benefits such as improved security and redundancy, making them essential for high-traffic websites.