Is there a way to incorporate an electronic signature into a form?

Is there a way to incorporate an electronic signature into a form?

Yes it is indeed possible to add a signature field into your form. Simply add the Smooth Signature widget to collect the user's signature. Here's the link to the widget: http://widgets.jotform.com/widget/smooth_signature 

To add a widget to the form, simply follow this guide: How to Add a Widget to your Form?