Content Delivery Networks (CDNs) reduce latency and improve performance for global users by distributing content through edge servers near them. CDNs enhance website speed, manage traffic spikes, strengthen security with DDoS protection and HTTPS encryption, and provide real-time analytics. Key features like edge caching, dynamic content acceleration, and anycast routing support global optimization. Providers like Netflix, Shopify, Cloudflare, and Akamai demonstrate CDN success. Selecting a CDN involves considering geographic reach, performance, cost models, and compliance. Emerging trends include edge computing and AI-driven optimization. Implementing best practices ensures efficient, secure global content delivery.