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Purpose: To organize library materials by subject. Application: Used primarily in academic and research libraries throughout the United States.

Purpose: To provide a simpler and more concise list of subject headings for small to medium-sized libraries. Application: Commonly used in public libraries, school libraries, and smaller academic institutions.

Purpose: To provide a framework for the description of library materials that is based on user tasks. Application: Serves as the current standard for cataloging all types of resources in the digital age.

Purpose: To provide a unique identifier for periodicals and serials. Application: Used to manage and link serial publications globally.

Purpose: To provide a set of rules for cataloging library materials in English-speaking countries. Application: Used widely until the adoption of RDA, it standardizes bibliographic description and access points across libraries.

Purpose: To organize materials by an elaborate system of synthesized numerical codes. Application: Used for classification in some European countries and specialized libraries.

Purpose: To standardize the bibliographic description presented in catalog records. Application: Guides the creation of consistent and international cataloging for all types of resources.

Purpose: To provide a conceptual framework for understanding how information about resources is related and accessed. Application: Influences the structure of cataloging databases and RDA.

Purpose: To simplify LCSH for efficient and user-friendly access in digital environments. Application: Used for cataloging in various digital library projects and databases.

Purpose: To provide a set of vocabulary terms used to describe web resources. Application: Useful for simple and generic resource description across a variety of fields.

Purpose: To enable the interpretation and exchange of bibliographic information in machine-readable form. Application: Underpins cataloging systems enabling data sharing among libraries globally.

Purpose: To provide a comprehensive subject headings list for cataloging and indexing materials in libraries. Application: Utilized globally for subject access in library catalogs.

Purpose: To provide a unique identifier for books. Application: Used to simplify ordering, inventory management, and data management in bookselling and publishing.

Purpose: To provide cataloging data for materials before their publication. Application: Libraries use this data to catalog books rapidly upon receipt, as the data is already available.