(1) (Data Description Language) A language used to define data and their relationships to other data. It is used to create the data structure in a database. Major database management systems (DBMSs) use a SQL data description language.

(2) (Document Description Language) A printer control language from Imagen that runs on the HP LaserJet series.

(3) (Direct Data Link) The ability of a supplier to directly interrogate a customer's inventory database in order to manage scheduling and shipping more efficiently. Pioneered by Ford Motor Co. in 1988, Ford lets suppliers check stock levels in assembly plants throughout North America.