A phased rollout is a deployment strategy used in cybersecurity and software development where new features, updates, or security patches are gradually introduced to a select group of users, devices, or geographic regions before being made available to the entire user base. This approach allows organizations to monitor the impact of changes, identify potential issues, and gather feedback in a controlled environment, minimizing the risk of widespread disruptions or vulnerabilities. Phased rollouts are particularly useful for managing large-scale updates, ensuring higher stability, and maintaining security by limiting exposure during the initial stages of deployment.