[label:cms_e]What is the difference between the "Content" and  the "Resource"?

The "Content" means the unit for delivery.
The "Resource" means the data such as documents, images, and videos, that are used to create contents. 
A content is made of a base PDF file, and images and videos that are overlaid on the base file.

For your help, a .zip file has a similar structure as a content of SMART CATALOG.
The "Content" is compared to a .zip file. And PDF file, images, and videos are compared to the components of the .zip file.

The application shows the "Contents".