Components of a Jenkins Pipeline.

A Pipeline is a user-defined model of a CD pipeline. A Pipeline's code defines your entire build process, which typically includes stages for building an application, testing it, and then delivering it. Also, a pipeline block is a key part of the Declarative Pipeline syntax.

A node is a machine that is part of the Jenkins environment and is capable of executing a Pipeline. Also, a node block is a key part of Scripted Pipeline syntax.

A stage block defines a conceptually distinct subset of tasks performed through the entire Pipeline (e.g. "Build", "Test" and "Deploy" stages), which is used by many plugins to visualize or present Jenkins Pipeline status/progress.

A step tells Jenkins what to do at a particular point in time (or "step" in the process). For example, to execute the shell command make use of the sh step: sh 'make'. When a plugin extends the Pipeline DSL, that typically means the plugin has implemented a new step.

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