JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
Basically these are the submissions that require the payment (per form setup), but the users decided not to make the payment on the payment processing tool.
This is also useful if you are using Purchase Order tool, which allows you to turn the incomplete submission into complete one as soon as the payment has been made over check, bank transfer, etc.
You can read more about this here: How to View Incomplete Payments
If you are using PayPal processing tool, you should also take a look at the following guide: Paypal Incomplete Payments FAQ
Of course, if you have any further questions do let us know and we would be happy to answer them.