The term '''data set''' or '''dataset''' is used to refer to [[computer file|file]]s on an [[IBM]] [[mainframe computer]], typically stored on [[DASD]] or [[magnetic tape]].
IBM mainframe term for a file.
Unlike files on [[UNIX]] filessystems, they are not unstructured streams of bytes[[byte]]s, but rather comeare organized in various block structures determined by the DSORG (data set organisation) parameter of the [[JCL]] which was used allocated them.
e.g.For example, a '''PDS''' =or Partioned'''Partitioned Data Set''' is a (dataset dividedcontainining intomultiple partions''members'', each of which holds a separate sub-data set, --similar kind of liketo a [[directory]] in other systems)types of [[file system]].
