Resources provide the ability to read and write data from and to an external system or service.
You can create a new Resource by right-clicking in the Entites tree and selecting File > New > ... Resource, where the ... depends on the type of Resource to be created.
Verj.io provides several different types of Resources that correspond to different types of system they interact with, including:
Email Resources.
Database Resources.
REST Resources.
SOAP Resources.
XML Resources.
Resources added to a 
Form are listed in the 
Resources View in the top-right corner of the Form's editor.
You can add Resources to your Form by dragging them in from the Workspace or by clicking the 
Add Resource button.