Marketing Cloud is the marketing automation package from Salesforce. CampaignSuite offers a number of extensions to Gravity Forms that allow various connections to be made with Marketing Cloud. Think about:
Creating a Transactional Email event
Creating a Journey event
Prefilling a form based on Marketing Cloud Contact data
Use dynamic content from Marketing Cloud on pages based on unique parameters
Prefilling data and retrieving dynamic content from Marketing Cloud does require specific Cloud Pages. If you want to make use of this, please contact us.