What is the main purpose of a data dictionary in an information system?

A data dictionary serves a crucial role in an information system by providing standardized definitions for the data elements utilized within that system. Its primary purpose is to ensure consistency in how data is defined, stored, and interpreted across the system. By having clearly defined terms, users can understand the meaning of the data fields, the format required, and how the data relates to other elements within the system. This standardization is essential for data integrity, interoperability, and effective data management, allowing various stakeholders to communicate clearly about the data without confusion.

In contrast, while tracking system changes, storing patient records, and generating reports are all important functions within an information system, they do not encapsulate the primary role of a data dictionary. A data dictionary does not directly manage system changes, store data like patient records, or create reports; instead, it underpins these processes by providing the necessary context and definitions for the data involved. This is why the main purpose of a data dictionary is best reflected in its ability to standardize definitions.