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MARC tagging is variety of codes, usually called tags, indicators, and delimiters, to signal to a computer that a certain type of information is following the code so that it can format it correctly and allow proper searching.

Data Classification Examples Credit card numbers (PCI) or other financial account numbers, customer personal data, FISMA protected information, privileged credentials for IT systems, protected health information (HIPAA), Social Security numbers, intellectual property, employee records.

The MARC record contains a guide to its data, or little "signposts," before each piece of bibliographic information.

A MARC 21 format is a set of codes and content designators defined for encoding a particular type of machine-readable record. The MARC 21 formats as a group serve as a vehicle for authority, bibliographic, classification, community information, and holdings data of all types.

What is a MARC record? A MARC record is a MA chine-Readable Cataloging record. And what is a machine-readable cataloging record? Machine-readable: "Machine-readable" means that one particular type of machine, a computer, can read and interpret the data in the cataloging record.

MARC is an acronym for MAchine Readable Cataloging. This is a computerized method of recording the information needed in a cataloging record: the descriptive cataloging, subject headings and other access points, and classification numbers and other call number information.

A MARC record involves three elements: the record structure, the content designation, and the data content of the record. 1.2. 1. The structure of MARC records is an implementation of national and international standards, e.g., Information Interchange Format (ANSI Z39.