Back OPAC ALS Электронны каталог Byelorussian অনলাইন পাবলিক অ্যাকসেস ক্যাটালগ Bengali/Bangla Catàleg d'accés públic en línia Catalan OPAC 2.0 Czech OPAC German Δημόσιος διαδικτυακός κατάλογος ανοιχτής πρόσβασης Greek Catálogo en línea Spanish فهرست برخط دسترسی همگانی Persian Online public access catalog French
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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.