Demo Bundle is a sample website you get with your installation of eZ.
You can use the Demo Bundle to view and test the capabilities of the system. There are two different Demo Bundles: one for eZ Platform and one for eZ Studio.
The Bundle contains a number of preset Content Types. You can apply them directly in your website or use them as a starting point to create your own Content Types.
When building your content model, get to know the Almighty Content Type (from the Platform Demo Bundle) to understand all fields which are available by default in eZ. Almighty demonstrates all Field Types available in the system.