How Cloudflare works. Fundamentally, Cloudflare is a large network of servers that can improve the security, performance, and reliability of anything connected to the Internet. Cloudflare does this by serving as a reverse proxy for your web traffic. All requests to and from your origin flow through Cloudflare and — as these requests pass …
https://support.cloudflare.com/hc/en-us/articles/205177068-How-does-Cloudflare-work-