1) Pipeline: User-defined model of a CD pipeline. The pipeline's code defines the entire build process, which includes building, testing and delivering an application
2) Node: A machine that is part of the Jenkins environment and capable of executing a pipeline
3) Step: A single task that tells Jenkins what to do at a particular point in time
4) Stage: Defines a conceptually distinct subset of tasks performed through the entire pipeline (build, test, deploy stages)
