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What does "blue-green deployment" mean in programming?
blue-green deployment is one of the most common terms in software development. This guide explains what it means, how it is used in practice, and why it matters, with real examples from the developer world.
Definition
A deployment strategy that maintains two identical production environments (blue and green). At any time, one is live and the other is idle. When deploying, you update the idle environment and then switch traffic to it. Rollback is instant: just switch traffic back.
Example
"We use blue-green deployments so we can roll back in seconds if the new version has issues."
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