Files may be deleted one-by-one, or a whole directory tree may be deleted.
Deletion is not always permanent. Sometimes information and even people can be retrieved. When Mainframe crashed and came back on-line many of it's citizens were restored after having been deleted. This is because they were still stored in system directories, they were simply no longer active data. (End Prog)
If the person is not retrievable by any means they are refered to as Erased.