A DBD control is a type of control used in database management systems to ensure the accuracy and integrity of data. It is a set of rules that are enforced by the database management system to ensure that data is stored and accessed in a consistent and secure manner. The main purpose of DBD controls is to ensure that data is consistent, accurate, and secure. This is accomplished by enforcing rules such as data validation, data integrity, and data security. Data validation ensures that data is entered correctly and that it meets certain criteria. Data integrity ensures that data is stored in a consistent manner and that it is not corrupted or altered. Finally, data security ensures that data is kept safe from unauthorized access. DBD controls are an important part of database management systems and help to ensure that data is stored and accessed securely and accurately.