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Blue-Green Deployments stand out as a technique focused on ensuring reliability in deployments. This method involves maintaining two separate but identical environments: one that is currently live (the blue environment) and another that is idle (the green environment). When it's time to deploy a new version of an application, the deployment is first completed in the green environment. Once testing and validation are confirmed, traffic is switched from the blue environment to the green environment. This switch can occur almost instantaneously, reducing downtime and allowing for immediate rollback to the previous version if any issues arise.

The reliability aspect comes into play as only verified code is moved into production, providing a clean separation and minimizing risk. Since the blue environment remains untouched during the deployment of the green, if problems occur after the switch, reverting back to the blue requires little effort, ensuring continuity and reliability in user experience.

In comparison, while other techniques like Rolling Updates, Feature Flags, and Canary Releases also play significant roles in deployment strategies, they don’t provide the same level of assurance for complete rollbacks and instant recovery as Blue-Green Deployments do. This makes Blue-Green Deployments particularly effective for organizations that prioritize reliability in their release processes.