What is the purpose of a data dictionary?

The purpose of a data dictionary is to establish the structure of data elements in the system. A data dictionary serves as a centralized repository that contains important details about the data within a system, including definitions of data elements, their types, formats, constraints, and relationships with other data. This helps ensure consistency and clarity when it comes to data management and utilization throughout the system's lifecycle.

Having a well-defined data dictionary enhances communication among team members, supports database design and structure, and facilitates system maintenance and updates, making it a critical component of systems analysis and design.