To resolve these issues, Kubernetes provides another API Object called StorageClass. With StorageClass, Kubernetes is able to interact with the cloud provider directly. This allows Kubernetes to provision new storage volumes, and create PersistentVolumes automatically.
Basically, a PersistentVolume is a representation of a piece of storage, whereas StorageClass is a specification of how to create PersistentVolumes dynamically. StorageClass abstracts the manual processes into a set of fields you can specify inside a manifest file.