This document discusses the Anglo-American Cataloguing Rules 2nd Edition (AACR2), which provides standards for bibliographic description used by libraries. It was developed in 1967 with revisions in 1978, 1988, and 2002. AACR2 is organized into chapters covering various formats like books, maps, music, and electronic resources. It is intended to promote consistency in cataloging records internationally. However, issues with AACR2 include inconsistencies, difficulty applying older rules to new formats, and lack of flexibility. This led to calls for developing new cataloging standards.