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OCLC makes WorldCat itself available free to libraries, but the catalog is the foundation for other subscription OCLC services (such as resource sharing and collection management). WorldCat is used by librarians for cataloging and research and by the general public.
Users need to account for qualities and limitations of databases and search engines, especially those searching systematically for records such as in systematic reviews or meta-analyses. [2] As the distinction between a database and a search engine is unclear for these complex document retrieval systems , see:
OCLC has collaborated with Wikipedia in several ways. For example, in 2017, OCLC's WorldCat Search API was integrated into the cite tool of Wikipedia's VisualEditor, [2] [3] allowing Wikipedia editors to easily cite sources from WorldCat, which is the largest international online public access catalog (OPAC) in the world. [4]
WorldCat Discovery, a bibliographic discovery system that allows library patrons to use a single search interface to access an institution's catalog, ebooks, database subscriptions and more [28] [29] WorldShare Management Services, an electronic resource management system [30] [29]
Library holdings are tracked by WorldCat, a union catalog that itemizes the collections of 72,000 libraries in 170 countries and territories. Bibliographies were available at WorldCat Identities, a project ceased to exist. WorldCat's new authority file is called WorldCat Entities. Sample output: Murasaki Shikibu in libraries (WorldCat catalog)
The largest international library catalog in the world is the WorldCat union catalog managed by the non-profit library cooperative OCLC. [3] In January 2021, WorldCat had over half a billion catalog records and three billion library holdings. [4] Card catalog at Yale
The largest union catalog ever printed is the American National Union Catalog Pre-1956 Imprints (NUC), completed in 1981. [1] This achievement has since been superseded by the creation of union catalogs in the form of electronic databases, of which the largest is OCLC 's WorldCat . [ 2 ]
Newer generations of library catalog systems, typically called discovery systems (or a discovery layer), are distinguished from earlier OPACs by their use of more sophisticated search technologies, including relevancy ranking and faceted search, as well as features aimed at greater user interaction and participation with the system, including tagging and reviews.