...It extends Kubernetes with custom resources (e.g., Certificate) that allow you to declare certificate requests inside the cluster, and the controller handles issuance, renewal, and secret management for you. The tool is built to show how you can write Kubernetes controllers, use third-party resources, and react to changes in the API via watches and reconciliation loops. It supports DNS-01 challenge flows for ACME, allowing you to validate domain ownership and provision certificates automatically. It also integrates with Secrets and Ingress resources so you can consume the certificates in your applications easily. Although the project is primarily a demonstration or teaching project, it laid groundwork for more mature certificate controllers in the Kubernetes ecosystem.