What is this? And wjy do I need it?

JotForm is online form builder and you can use it for creating a variety of forms that your users can submit online.

You can check samples of forms here: 

https://www.jotform.com/form-templates/?classic

https://www.jotform.com/form-templates/?cards

Also, please check this guide on how to start:

https://www.jotform.com/help/2-How-to-Create-Your-First-Web-Form

If you have any further questions, please let us know.

Thank you!