Harness is an enterprise continuous delivery (CD) platform that automates safe deployments across cloud infrastructure, on-prem data centers, and hybrid environments. It handles deployment pipelines, blue-green switching, canary rollouts, automated rollbacks, and compliance auditing in a single interface. Unlike CI/CD tools (Jenkins, GitLab CI), Harness specializes in the "D"—making deployments themselves safer and more observable. It integrates with your monitoring platforms (DataDog, Prometheus) to verify that deployments are working before traffic shifts fully.