Blue-green deployment is a deployment strategy that reduces downtime and risk by running two identical production environments called "blue" and "green". At any time, only one of the environments is live, serving all production traffic. During a deployment, the new version of the application is deployed to the inactive environment (e.g., green). Once the new version is fully tested and verified in the green environment, traffic is switched from the blue environment to the green environment. If any issues arise, traffic can be switched back to the blue environment.
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