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(Redirected from Online catalog)
An online public access catalog (OPAC) refers to a library catalog accessible from a computer or other electronic device; a computer catalog of the books and other materials owned by a library; a library catalog whose records are in machine-readable (digital) format and maintained on a computer which provides interactive access via terminals or PCs which are in direct, continuous communication with the computer during each transaction.
Often it is used as part of an ILS (Integrated Library System).
Libraries may have different naming conventions for what their catalog is known as to the public.