Iframes provide a way of displaying content from elsewhere on the web via a Mosaic site. This makes it possible to integrate functionality not currently available via the Mosaic platform itself into a Mosaic site.
This page uses an iframe to display an online survey. Users can easily complete the survey via the iframe, without needing to leave this web page.
A couple of other examples of iframes can be seen in the other pages in this section: a survey using Microsoft Forms, and an interactive visualization.