Let's use the scenario of wanting to include a new code version as an example. The outdated code must now be swapped out for the updated code. The current version is thought to be in a green environment, while the old version is thought to be in a blue environment. We had made certain modifications to the earlier version, which then underwent minimal adjustment to become the new version.

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We must now transfer traffic from the old instance to the new instance in order to execute the new version of the instance. As a result, we must move the traffic from the blue to the green environment. The green instance will be using the new version. The traffic is gradually switched over to the green instance. The rollback will be performed using the blue instance, which will remain idle.

The application is not deployed in the same environment when using Blue-Green deployment. The new version of the programme is instead deployed on a new server or environment.

Traffic to the old version of the application is diverted to the new version of the application once the new version has been installed in a separate environment.

We use the Blue-Green Deployment approach to ensure that any issues with the new application that arise in the production environment are identified. With little to no impact on the business, the traffic can be promptly diverted to the prior Blue environment.