Performance CDN Website Optimization SSL DNS Load Balancing Dedicated SSL Certificates Accelerated Mobile Links
Security DDoS Protection Firewall SSL Secure Registrar Dedicated SSL Certificates Rate Limiting Orbit'
Reliability
http://www.scalescale.com/wp-content/uploads/2014/11/how-cloudflare-works4.png
https://www.scalescale.com/scaling-cloudflares-massive-waf/#
User session analysis and search enhancements https://www.dynatrace.com/blog/user-session-analysis-search-enhancements/