Nature is a crucial element when we are using it for landing pages and campaign alike.
Usually, we have following web application nature available in the Adobe Campaign.
This is not the final list but close to all OOTB natures. We have used these natures to decide the Web application goals. for Example, If you select Survey as nature this will behave differntly if you have selected subscription. The survey will enable you to store all questions responses automatically whereas subscription will allow you to store subscription of the user in the data base. If you are not sure how to
You can extend these values by extending nms:webApp schema and adding more values to webAppNature enumeration in the web app. If you are not sure how to use nature effectively for Campaign or web forms you can check out this link for further study.