Fastly, Inc. is an American cloud computing services provider based in San Francisco. Fastly provides content delivery network services, cloud computing, cloud security, image optimization, and load balancing services. Fastly's cloud security services include denial-of-service attack protection, bot mitigation, and a web application firewall. The Fastly platform is built on top of Varnish. As of March 2024, Fastly transfers 336 Tbps of data. Wikipedia