Adobe Campaign comes with a pre-defined data model. This data model can be modified by administrators with new resources or extensions to existing resources.
The Administration > Development menu, accessed via the Adobe Campaign logo, allows you to manage your custom resources, publish them, and access the diagnostic tools.
You can enrich the data template that is provided by creating your own custom resources, such as purchase or product tables.
Out-of-the-box resources (such as campaigns, emails, or audiences) cannot be modified. However, custom resources can be extended to add new fields.
You can find a datamodel representation for the out-of-the-box resources here.