Content Delivery Networks (CDNs) offer significant security benefits beyond improving website performance. They help mitigate Distributed Denial of Service (DDoS) attacks by distributing traffic, detecting and blocking suspicious patterns, and using Anycast routing. Integrated Web Application Firewall (WAF) protection shields against SQL injection, XSS, and CSRF attacks, while enforcing SSL/TLS encryption secures data transmission and supports compliance with regulations like GDPR and PCI-DSS. CDNs also combat malicious bots through behavioral analysis and IP reputation filtering, reduce the attack surface by hiding the origin server, and provide advanced security for APIs via rate limiting and authentication. Continuous updates and global threat intelligence ensure robust defense against emerging vulnerabilities.