Continuous Integration: Automation to build and test applications whenever new commits are pushed into the branch.
Continuous Delivery: Continuous Integration + Deploy application to production by "clicking on a button" (Release to customers is often, but on demand).
Continuous Deployment: Continuous Delivery but without human intervention (Release to customers is ongoing).
Scripted Pipeline: Original, code validation happens while running the pipeline. Can’t restart. Executed all stages sequentially.
Declarative Pipeline: Latest, first validates the code, and then runs the pipeline. Restarting from a specific stage is supported. A particular stage can be skipped based on the when directive.
