Explain what pod deletion in Kubernetes is and what it is used for.

In Kubernetes, deleting a pod is the process of removing a Pod object from the cluster. A pod is the smallest deployable unit that contains one or more containers.

Pod deletion is applied in the following cases:

• Application update: when deploying a new version, pods are deleted and recreated with the updated image.
• Scaling: when decreasing the number of replicas, pods are deleted.
• Cleaning up non-functioning or stuck pods.
• Resource management and maintaining the desired state of the cluster.

It is important to note that when using controllers (e.g., Deployment), deleting a pod results in the creation of a new one to maintain the specified number of replicas.

Example command to delete a pod:

kubectl delete pod <pod-name>