JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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Unique ID widget is used if you need to unique identify each form submission. Unique ID field will not be visible inside of your form but it will be show inside of your submissions or reports. You can also use it to count your submissions. More about Unique ID widget you can find inside of this article:
Hope this will help. Let us know if you need further assistance.