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MARC stands for MAchine-Readable Cataloging. It is a standard that ensures computers can read and interpret cataloging data and display this data to users in an online catalog.
MARC-21, the current version of the standard, consists of variable fields and fixed fields, along with their subfields and indicators. Common MARC fields include:
- 100 author of a work
- 245 title of a work
- 260 publication information
- 300 physical description
- 490 series statement
- 5xx notes
Eventually, MARC will be replaced by BIBFRAME.
- MARC standards at the Library of Congress 
- MARC standards at OCLC 
- "WHAT IS A MARC RECORD" booklet from the University of North Carolina