Replication Controller

The Replication Controller in Kubernetes ensures that a specified number of pod replicas are running at any given time. It manages the lifecycle of pods, ensuring that they are created, maintained, and deleted as necessary, based on the desired replica count. While the Deployment resource is now the preferred method for managing replicated pods, the Replication Controller is still an important concept and useful for simpler scenarios where a rolling update or other advanced features are not required.

Use Case of Replication Controller -

• Scaling Applications
• Fault Tolerance
• Self-Healing
• Simpler Workloads

More Details: https://kubernetes.io/docs/concepts/workloads/controllers/replicationcontroller/