Could you explain the principle of Blue-Green deployment and its advantages?

Blue-Green deployment is a deployment strategy where two identical environments exist: the current one (e.g., "Blue") and a new version of the application ("Green"). The new version is deployed in the Green environment, where testing occurs. After verification, traffic is switched from Blue to Green, minimizing downtime and risks. Advantages:

• Quick rollback to the previous version by simply switching traffic back.
• Minimization of downtime and failures for users.
• Ability to test the new version in real conditions without affecting users.

Example: in Kubernetes, you can use two sets of pods and switch the service between them.