Cloudflare Tunnel allows you to publish local applications to the Internet via a public hostname. For example, you can add a published application route that points docs.example.com to https://localhost:8080. Anyone can now view your application by going to docs.example.com in their web browser.
Cloudflare can route traffic down your Cloudflare Tunnel using a DNS record or Cloudflare Load Balancer. You can configure either option from the Cloudflare dashboard by pointing a DNS CNAME record or a load balancer pool to your Cloudflare Tunnel subdomain (<UUID>.cfargotunnel.com, or <UUID>.fed-cfargotunnel.com on accounts in Cloudflare's FedRAMP High environment). You can also associate these records with your tunnel from cloudflared directly.
For TCP or UDP applications, Cloudflare can also route traffic through a Spectrum application attached to a virtual network.