Where does it go when they hit submit on the online application?

When a potential employee fills out an online application and hits submit where does that information go?

The information filled on your JotForm and submitted, it will be stored in your JotForm account. You can view the submissions after you login to your JotForm account.

https://www.jotform.com/help/269-How-to-View-Form-Submissions 

You can also integrate the form to store the form information to your Google Drive/Spreadsheet or DropBox, etc. Please take a look at our Apps that can be integrated with your JotForm.

Let us know if you need any further assistance. We will be happy to assist.