Blue-green Deployment

Blue-green deployment is an approach to software releases that runs two identical production environments at once. One environment, the "blue," receives all user traffic, while the other, the "green," acts as a staging area for new updates and releases. When the update is ready, you can switch traffic allocation to the green environment, allowing a launch with minimal downtime and maintaining a stable backup in the blue environment to switch back to should problems arise. Example: You test a new feature in an otherwise identical environment and start sending traffic there. An hour in, an unforeseen error starts causing usability issues, so you move traffic back to the original environment while you sort out the bug.