OPAC (Online Public Access Catalogue)
An Online Public Access Catalog (often abbreviated as OPAC or simply Library Catalog) is an online database of materials held by a library or group of libraries. It is a computerized library catalog available to the public. Most OPACs are accessible over the Internet to users all over the world. Users search a library catalog principally to locate books and other material physically located at a library.
The patrons in the library can search the bibliographic database and find specific information online. The search facility also apprises the user about the availability of each item for circulation, including current status of individual copies of a title and reserve status. It also shows titles on order displaying current status in acquisition.