All the data stored in InfoPath forms are stored in an XML format, which is referred to as the "data source". The form template must have one primary data source for submitting data and can have multiple secondary data sources for retrieving data into the form.
All data within InfoPath forms are saved in an XML format, which is called the "data source". The form template must have one main data source to submit data and can include multiple auxiliary data sources for fetching more details into the form.