What is a Data Dictionary?

A Data Dictionary serves as a repository that defines data meanings, relationships, and attributes within a database or information system. It includes key information such as data types, descriptions of data entities, constraints, and the relationships between different data elements. This centralized documentation is crucial for understanding how data is organized and how it can be used effectively.

In essence, a Data Dictionary enhances data management by ensuring that everyone using the data understands its context and structure, facilitating better communication among users, database administrators, and developers. By providing comprehensive metadata about the data, it helps to ensure data integrity and consistency across various information systems.