OPAC (Online Public Access Catalog)
An OPAC (Online Public Access Catalog) is an online bibliography of a library collection that is
available to the public. OPACs developed as stand-alone online catalogs, often from VT100 terminals
to a mainframe
library catalog. With the arrival of the Internet, most libraries have made their OPAC accessible
from a server to users all over the world.
User searches of an OPAC make use of the Z39.50 protocol.
This protocol can also be used to link disparate OPCS into a single "union" OPAC.
Contributor(s): Simon Smith
This was last updated in April 2005
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