What is the primary purpose of the ABAP Data Dictionary?

The primary purpose of the ABAP Data Dictionary is to define data elements, domains, and table structures. It serves as a central repository in SAP systems where all the data definitions are stored and managed. This includes defining the structure of tables, views, data elements, domains, and other key components that are essential for the management and organization of data within SAP applications.

By utilizing the ABAP Data Dictionary, developers can ensure consistency in data definitions across various programs and applications. It helps to maintain data integrity, as all data definitions are centrally controlled, allowing for easier updates and maintenance. Additionally, it plays a crucial role in defining relationships between different database objects, supporting both the data model and the business logic behind the various SAP applications.

Other options like managing user roles, executing ABAP code, or enhancing the GUI do not align with the primary purpose of the Data Dictionary, which focuses specifically on the definition and structure of data rather than functionality relating to user access, code execution, or interface enhancements.