What is a data dictionary?

A data dictionary serves as an essential reference tool that provides a detailed description of data elements used within a particular database or information system. It is a set of metadata that contains information such as the names, types, properties, and constraints of data elements, which helps in understanding and maintaining the data. By organizing this information, the data dictionary enables users and developers to efficiently manage data, ensuring consistency and clarity across various systems and applications.

This resource is vital for database management, data analysis, and data governance because it helps users understand what each piece of data means, how it can be used, and how it is interrelated with other data elements. It minimizes confusion and aids communication between data stewards, developers, and end-users, ultimately enhancing data quality and usability.

In contrast to other options, a collection of user accounts or a list of website links does not provide the comprehensive description of data elements necessary for understanding data structure. Similarly, a summary of business goals does not relate directly to the technical aspects of data elements that a data dictionary covers.