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Continuous Integration: every push is built and tested automatically, so problems surface within minutes.
Continuous Delivery / Deployment: builds that pass are packaged and released to environments, either with a manual approval (delivery) or fully automatically (deployment).
Why it matters for security: the pipeline holds production credentials, so it is a prime target. Scan code and dependencies in the pipeline, keep secrets in a vault, pin third-party actions, and lock down who can change pipeline definitions.
