In the initial screen of the Data Modeler you can call the SAP Architecture model, the SAP Application model or other data models.
The SAP Architecture model is the overall model of the SAP system. It contains all information objects and their relationships with each other.
The SAP Application data models are views of the Architecture model. They contain only information objects and relationships which are significant for each application.
Other models include both SAP models which are used for courses or documentation, and the customer-specific models.