With our free widgets, the photos will go to a SnapWidget page when clicked to display the full sized version of the photo.
With the pro widgets, the photos will go directly to Instagram (or another URL you set) when clicked. You can also have the photos open in a Lightbox to keep visitors on your website. This feature is available when you upgrade to the Lite, Pro or Developer plans.
Here is some info about the different widget features: https://snapwidget.com/compare
For more info on our paid plans, you can check out our pricing page: https://snapwidget.com/pricing