Field groupings are Element451's way of grouping together for easier management of data within that grouping. For example, the home address field group contains a series of fields that are related to address:
Address Line 1
Address Line 2
Whether or not this is the mailing address.
Utilize groupings to quickly add large groups of fields at one time to your forms and applications. Once you've added the field group, if you don't want to display all of the grouped fields, you can click on the edit button and modify which individual fields are visible and required: