Answer / deepak gairola

Cataloged procedures in JCL can not have instream data(we
can't Use SYSIN DD * statements), so the data needed to
pass to them is put into a Control Card.

Control Card is an element in a PDS.

Means:
The input that we need to give to a procedure like sort
fields..record feilds to be processed are generally put in
the pds member and this is specified in the jcl procedure
as

//ddname dd dsn=pdsname (member)

This member is called a control card

Similarly, you can also pass the data through the SYSIN
parameters.

Answer / gaurav

control card is simply a dataset containg mostly one record
which is passed in the jcl.

Answer / vanz

It depends.
"Control cards" come in many flavors. . . There are control
cards for the sort, most utilities, and many application
programs.

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