A Jenkinsfile is a specific type of file used in Jenkins, which is an open-source automation server. Jenkins is commonly used for building, testing, and deploying software projects. The Jenkinsfile is a declarative or scripted text file that defines the entire Continuous Integration/Continuous Deployment (CI/CD) pipeline for a software project.
A Jenkinsfile encapsulates the entire build and deployment process as code, allowing developers and DevOps teams to define, version, and automate their pipelines. It is typically stored alongside the source code of the project in the version control repository (e.g., Git) and is executed by Jenkins to automate the defined stages and steps of the CI/CD pipeline.