A data dictionary is a document or a file that stores the data definitions and descriptions of the structure of data used in the database.

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A data dictionary is a document that contains metadata about the data in a database, including data types, field descriptions, and any constraints or relationships between data elements. It provides a comprehensive overview of the structure and content of the database, and is an important resource for developers, database administrators, and other users who need to work with the data.

A Data Dictionary Is a Document or a File That