Safe Software Deployments: Z Deployments` is a technique developed by Mark Porter to mitigate fear and downtime in software deployment. It involves testing rollbacks in staging, rather than just Prod, to make them predictable and reliable. This approach helps to ensure that rollbacks are successful and reduces the risk of downtime. The goal is to make rollbacks as easy and straightforward as "Command Z" on a keyboard, allowing developers to trust their staging environment and deploy with confidence. By using this technique in conjunction with other methods such as the 180 Rule and the Goldilocks Gauge, teams can achieve safe software deployment and reduce the fear associated with it.