A Data Dictionary is a glossary of defined data types which can be assigned to an attribute. You can create your own Data Dictionary or use the Data Dictionary which is provided with Creo Elements/Direct Manager Server. You can also edit or delete entries in the Data Dictionary. You can assign the Data Dictionary to some Creo Elements/Direct Model Manager attributes.

For example, in the following figure, the Data Dictionary of the Material attribute contains a list of materials to select from.