What system allows library patrons to access MARC records on the computer?

The system that allows library patrons to access MARC (Machine-Readable Cataloging) records on the computer is the Online Public Access Catalog, commonly referred to as OPAC. OPAC is a digital catalog that provides users with the ability to search for and find information about the library's collection, including books, journals, and other resources. It usually offers features such as keyword searches, filtering by various categories, and detailed records that include MARC information, which outlines various details about each item, like the title, author, subject, and publication information.

OPAC systems are designed to enhance user experience and make bibliographic data more accessible, facilitating patrons in finding the materials they need without needing to interact directly with library staff. By using OPAC, users can view comprehensive MARC records which are essential for understanding the specifics of library items, including their classifications and physical locations within the library. This aligns with the purpose of libraries to provide easy access to information and resources through technology.