Open-source automation server for continuous integration and deployment. Like having a dedicated quality control manager who automatically tests and delivers your products.
Development teams use Jenkins to automatically run tests and deploy code whenever changes are made.
Jenkins is an open-source CI/CD automation server you run yourself (on VMs, Kubernetes, or on-prem). Cloud providers offer managed CI/CD services that can replace or complement Jenkins, but there is no single native cloud service that is literally 'Jenkins'.