CDNs improve internet performance by distributing content across geographically located edge servers. When a user requests content, the CDN’s DNS directs the request to the nearest edge server, reducing latency and load times. If the content is cached, it’s delivered instantly; otherwise, it’s fetched from another server or the origin. CDNs save bandwidth, increase reliability, protect against DDoS attacks, and support global scalability. Caching strategies such as TTL and Cache-Control headers ensure content remains fresh. Companies like Cloudflare, Akamai, and Amazon CloudFront offer CDN services with varying features. CDN technology is evolving with edge computing, 5G, AI, and IoT integration to better handle emerging internet demands.