Content Delivery Networks (CDNs) are evolving to meet rising demand for fast, secure, and efficient content delivery. Edge computing is transforming CDNs by enabling local data processing, reducing latency, and supporting real-time applications like gaming and live streaming. AI and machine learning optimize routing and caching while enhancing security against threats like DDoS and bots. 5G networks are pushing CDNs to handle ultra-low latency and high-bandwidth traffic, especially for AR/VR and 4K/8K content. Sustainability efforts focus on energy-efficient data centers and smart caching to reduce the environmental impact. Innovations in video delivery include AI-driven ABR and hybrid P2P-CDN models. Blockchain is introducing decentralized CDNs and secure payment systems through smart contracts. Future success depends on adapting to these trends for speed, security, and scalability.