Jenkinsis aContinuous Integration (CI) serveror tool which is written in java. It provides Continuous Integration services for software development, which can be started via command line or web application server. And also, it is happy to know thatJenkinsis free software to download and install.

Continuous Integration (CI)is a development practice that requires developers to integrate code into a shared repository several times a day.It is a process of running your tests on a non-developer (say testers) machine automatically when someone pushes new code into the source repository

Continuous delivery (CD) Following the automation of builds and unit and integration testing in CI, continuous delivery automates the release of that validated code to a repository. So, in order to have an effective continuous delivery process, it’s important that CI is already built into your development pipeline. The goal of continuous delivery is to have a codebase that is always ready for deployment to a production environment.

Continuous deployment, The final stage of a mature CI/CD pipeline is continuous deployment. As an extension of continuous delivery, which automates the release of a production-ready build to a code repository, continuous deployment automates releasing an app to production. Because there is no manual gate at the stage of the pipeline before production, continuous deployment relies heavily on well-designed test automation.