online public access catalog
Sign in to saveAlso known as OPAC, online public access catalogue, Discovery layer
library catalog on the web
~6 min read
Encyclopedic overview
Example of online public access catalog The online public access catalog (OPAC), now frequently synonymous with library catalog, is an online database of materials held by a library or group of libraries. Online catalogs have largely replaced the analog card catalogs previously used in libraries.
History
Excerpted from Wikipedia’s “online public access catalog” article, available under the CC BY-SA 4.0 licence.