OPAC Online public access catalog
OPAC（全称Online Public Access Catalogue，图书馆联机目录，最新一代的产品往往也被称为“前端发现平台”）是一个电脑化的在线图书馆资源目录。读者可以通过万维网实现图书的查找和借阅。原来的电子书目用TELNET作为技术支持，但是已不能满足现今图书馆联盟间的书目进行汇总。现在的网上书目多以地区性图书馆的书目加以汇总，能使读者的查询结果覆盖更大范围的图书馆。
OPAC
中文百科
英语百科
Online public access catalog
（重定向自OPAC）
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. Users search a library catalog principally to locate books and other material available at a library. In simple language it is an electronic version of the card catalogue. OPAC is the gateway to library's collection.
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