Jenkins is an open-source automation server used to automate parts of the software development process. It facilitates continuous integration and continuous delivery (CI/CD) by automating tasks such as building, testing, and deploying code. Jenkins supports numerous plugins that extend its capabilities, allowing it to integrate with various development, testing, and deployment tools. It is highly configurable and can be used to automate a wide range of tasks, from simple scripts to complex pipelines. Jenkins helps teams deliver high-quality software faster by automating repetitive tasks and ensuring that code changes are continuously tested and deployed.