Blue-Green Deployment is a technique that reduces downtime and risk by running two identical production environments. In this approach, one environment (Blue) serves live production traffic while the other (Green) is used for deploying new versions of the application. Once the new version is tested and verified in the Green environment, traffic is switched from Blue to Green, making the new version live with minimal downtime. This method allows for easy rollback to the previous version if issues arise, ensuring a seamless and reliable deployment process. Blue-Green Deployment helps improve the availability and stability of applications in production.