What is the difference between Deployment and ReplicaSet?

Deployment and ReplicaSet are Kubernetes objects, but they serve different roles:

• ReplicaSet is responsible for maintaining a specified number of pod copies (replicas) in the cluster. It ensures that the desired number of pods is always running.

• Deployment is a higher-level abstraction that manages ReplicaSets. It allows for application updates (rolling updates), rollbacks, scaling, and managing the lifecycle of ReplicaSets.

In simple terms, Deployment creates and manages ReplicaSets, while ReplicaSet maintains the desired number of pods.

Example: when updating an application, you create a new Deployment, which will create a new ReplicaSet with the updated version, and the old ReplicaSet will gradually decrease.