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 environment is live, serving all production traffic. As you prepare a new version of your software, you deploy it to the environment that is not live (e.g., "Green"). After testing, you switch traffic to the "Green" environment, making it the live environment. The "Blue" environment is now idle and can be used for the next update. If a problem is detected, you can quickly rollback by switching traffic back to the "Blue" environment.
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