Adding the Contact details element to your form is handy if you want to contact your customers after they have filled out the form. There are several elements you can add to the contact details:
All email addresses
Only business email addresses
(Alternative) Phone number
All these options can be included, furthermore, you can also specify that these options are required to be answered.
There aren’t a lot of useful charts you can build with contact details. However, you could use the Score type, to see how often an email address, for example, was given.