Jenkins is an open-source continuous integration (CI) tool that helps orchestrate development processes with automation. To create a CI pipeline, users need to install the Jenkins Pipeline plugin and other necessary plugins, such as Pipeline Stage View and Multi-branch Pipeline. The pipeline script can be written within the Jenkins UI or in a container file called Jenkinsfile, which simplifies the chained CI pipeline by creating one job that reads the container file. The Jenkinsfile orchestrates different stages, including checkout, commit, acceptance, and testing, using nodes, stages, and build steps. Once developed, the pipeline script can be loaded into Jenkins to create an end-to-end CI solution, triggering automation of build, test, and deployment processes.