Datastores are logical containers, similar to file systems, that contain specific information of each storage device and provide a uniform model for storing virtual machine files . You can also use datastores to store ISO images, virtual machine templates, and floppy images.
Depending on the type of storage you use, datastores can be of the following types:
Virtual Machine File System (VMFS)
Network File System (NFS)
You can increase datastore capacity after you create a datastore but only if it is a VMFS datastore.