You can access the autofill export in the register view of your templates, by selecting the forms you want to export and clicking on 'Export CSV'.
The Autofill options take all the static data or data that is not in tables and put them into your CSV.
Standard CSV export
You would have your form, and if there are tables, there might be some gaps in the rows until the next form arrives.
Here is an example of a standard export:
Autofill CSV export
The autofill exports don't have any empty rows, instead, they contain all the static data (for example the form ID and the created date), hence they really facilitate the process of data analytics.
Here is an example of an autofill csv export: