OPAC

An Online Public Access Catalog or OPAC is a computerized online catalog of the materials held in a library. The library staff and the public can usually access it at several computer terminals within the library, or from home via the Internet. Since the mid-1980s, it has replaced the card catalog in most libraries. Since the mid-1990s, character-based OPAC interfaces are being replaced by Web-based interfaces. OPACs are often part of an integrated library system

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The largest OPAC is the giant OCLC WorldCat database, which is a catalog of materials held at collaborating public and private libraries worldwide. WorldCat only shows whether a given item is owned by a library system. It does not break down information by branch library or show which copies are currently on loan to users. WorldCat users must connect to a library's own OPAC to see that information.

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Catalog: A catalog (or catalogue) is an organized, detailed, descriptive list of items arranged systematically. It may also refer to a list of items enumerated with a specific numbering scheme....

Library: :Alternative meanings: Library (computer science), Library (electronics), Library (biology)...

Internet: This article is about the Internet, the extensive, worldwide computer network available to the public. An internet is a more general term informally used to describe any set of interconnected computer networks that are connected by internetworking....