Mapped Fields
A mapped field is connected to a corresponding field on a record or object in Slate, such as a person record, address, application, etc. This connection is made by selecting from the "System Field" drop down in a form field.
Unmapped Fields
An unmapped field is not connected to a corresponding field on a record or object in Slate. When submitted, the data will not be stored back to a record, but will be stored only on the form submission.
Form Fields
Form fields are data points collected on a form; these can be text boxes, prompt-driven lists, addresses, or many other types of data. Unmapped form fields can capture data that is not essential within the larger context of the person record as they will not store back to the record (though they can still be queried on using the Form Responses query base). Form fields mapped to system fields will be stored back on the associated record.