RDA is a new metadata standard that replaces AACR2. RDA is built on FRBR and FRAD conceptual models which analyze bibliographic data in terms of entities, attributes, and relationships. RDA focuses on the user and aims to provide data that helps users find, identify, select, and obtain resources. Key differences from AACR2 include taking data as it appears, recording relationships explicitly, and avoiding abbreviations to make data easier for users to understand.