Replication controller & ReplicaSets is not able to do the update and rollback apps in the cluster

A deployment is act as a supervisor for pod, giving you fine-grained control over how and when a new pod is

Rolled out, updated or rollback to a previous state

2.

When using deployment object we first define the state of the app, then k8s cluster schedule maintained app

instance onto specific individual nodes

3.

4. A deployment provides declarative updates for pods & replicasets

K8s then monitors if the node hosting an instance goes down or pod is deleted then deployment control it's

replicas

5.

6. this is provide a self-healing mechanism to address machine failure or maintenance