How can we ensure zero-downtime deployments with Kubernetes?

Example Concept: Kubernetes rolling updates allow you to incrementally replace Pods running the old version of your application with new ones. This is managed by the Deployment controller, which ensures that a specified number of Pods are updated at a time, maintaining the desired state and availability. Alternatively, blue-green deployments involve running two environments simultaneously — one live (blue) and one idle (green) — and switching traffic between them, allowing for seamless transitions and easy rollback if necessary.