CI vs CD: Continuous Delivery and Deployment Are Not the Same Thing | Learn in 30 Seconds
Three terms, two letters, and one distinction almost everyone blurs.
CI — CONTINUOUS INTEGRATION
Every change gets built and tested automatically as it's integrated. Not nightly, not before release — on every push. The point is that integration problems surface in minutes instead of hiding until release day.
Then the pipeline forks, and this is where the confusion lives:
CD — CONTINUOUS DELIVERY
Every change that passes is kept in a releasable state. It reaches staging automatically and then waits. A person decides when it goes live.
CD — CONTINUOUS DEPLOYMENT
Same pipeline, one thing removed: the approval gate. Changes that pass all checks go to production automatically, with nobody pressing anything.
That's the entire difference. Delivery means it *could* ship at any moment. Deployment means it *already did*. One has a human in the loop; the other doesn't.
Both are "CD", which is why the acronym causes so many arguments in planning meetings.
Two things worth saying plainly:
✘ CI/CD doesn't catch every bug. Your tests only find what they were written to find. A green pipeline means "nothing we checked for is broken," not "nothing is broken."
✘ Automatic isn't the same as safe. Continuous Deployment without feature flags, health checks, canary releases and a fast rollback path isn't speed — it's just a faster way to reach your users with a bad build.
What actually makes this work is smaller changes shipped more often. A pipeline is how you make that affordable.
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