Nintex Forms provide an interface between a user and persistent data. The form surface provides the ability to provide data entry structures such as list boxes (providing a set of choices), check boxes (providing yes and no settings), validation of data entry, and the ability to send the data to persistent storage such as a database. Nintex Forms are designed to work with Microsoft SharePoint lists and Nintex Workflow.
To get started – select the Nintex Forms from the list settings tab.
Default form would look like this
Save the Form.
End user would see the following Form while working with that specific list.
You can customize the Form as show below
It supports various type of rules as shown below
Validation can be done as shown below
End users would see the Form as shown below