what happens with form data?

When users submit a form, is the data from their submission saved in a spreadsheet that I can access?

When users submit a form, it is stored in your JotForm account and can be viewed from there:

http://www.jotform.com/help/269-How-to-view-Submissions

And can also be exported to a spreadsheet:

http://www.jotform.com/help/44-How-to-Export-Form-Data-to-Excel