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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:
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
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 ]
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 resources can also be linked to from any Wikipedia article ...
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)
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.
Open Library is an online project intended to create "one web page for every book ever published". Created by Aaron Swartz, [3] [4] Brewster Kahle, [5] Alexis Rossi, [6] Anand Chitipothu, [6] and Rebecca Hargrave Malamud, [6] Open Library is a project of the Internet Archive, a nonprofit organization.