Storage

Persistent Volume used by Persistent Volume Claims :
PVs are independent storage volumes that can be provisioned from different storage providers such as cloud storage or on-premise storage systems, and PVCs are used to request storage resources from the PVs.
there are many types of PV
Host Path mounts a file in Node filesystem to the pod. Is not usable when pod gets rescheduled.
Empty Dir is used for caching. Is automatically created empty by default for each pod if you specify it in your YAML. It uses RAM of the Node