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MARC 21 stands for MAchine-Readable Cataloging. It's a standard for encoding bibliographic and related information in machine-readable form.

Anglo-American Cataloguing Rules, Second Edition, is a widely used international standard for bibliographic description.

Resource Description and Access is a set of cataloging rules succeeding AACR2, designed for the digital world.

International Standard Bibliographic Description is a set of rules produced by IFLA for the description of a wide range of library materials.

Functional Requirements for Bibliographic Records is a conceptual model used for understanding and organizing bibliographic information in catalogs.

Dewey Decimal Classification (DDC) is a proprietary library classification system organizing library materials by fields of knowledge outlined in ten main classes.

The Library of Congress Classification (LCC) system is an alpha-numeric system used by most research and academic libraries in the U.S. for categorizing library materials.

A bibliographic record provides the description of an item in a library collection, including information like author, title, publisher, date of publication, and physical description.

An authority record is a database record that gives the authoritative form (such as the name of a person or organization) to be used in catalog entries.

Subject headings are controlled vocabulary terms used to describe the content of an item in a library catalog, facilitating search and retrieval by subject.

A call number is a code placed on the spine of a library book to indicate its place on the shelf and to facilitate retrieval.

A cataloging code is a set of rules used to create bibliographic records and other types of authority records in a library catalog.

A cross-reference in library cataloging leads a user from one catalog entry to another, often from a used to an unused term, or vice versa.

The main entry of a library catalog is the primary access point under which the record for an item is filed, typically under the name of the author or the title.

Tracings are notes made by catalogers on the bibliographic record to list all the access points for which additional entries are made in the catalog.

Online Computer Library Center is a nonprofit cooperative organization providing a shared technology service, research, and community programs for libraries worldwide.

Developed by Charles Ammi Cutter, it is part of the alphanumeric portion of a call number in library classification that represents the author’s name.

In library cataloging, a monograph is a text that is complete in one volume or a designated finite number of volumes, thus being distinguishable from serial publications.

An integrated library system is a comprehensive software used to manage library operations such as circulation, cataloging, acquisition, and inventory management.