ProPhoto provides several modules which can be used to create items in your page layouts. Find each type of module in the Elements sidebar area within the Visual Builder tool.
You will usually use the normal modules to add text, graphics, forms, WordPress page content, videos, featured images, and lots of other items to your layouts.
But the widget module can be used when you want to add a widget to your layout that is provided by WordPress or a widget that is added by a plugin you’ve installed.
For example, use a widget module to add a search box to your site, to add some custom HTML or embed code, even to add a MailChimp signup form created with a WordPress plugin you have installed.