A Catalog is like a registry where the MVS operating system maintains the Name, Location and other details like a pointer to an actual physical address.
LISTCAT command in VSAM is used to view the properties of VSAM file like volume details, space details, path details, and catalog details.
LISTCAT can list many properties like cluster, data, index, spae details, history, volume and much more.
Most used Syntax:
LISTCAT ALL ENTRIES(DATASET-NAME)