This is used for our product section IA. The product front matter is set on the _index.md page of each product section and cascaded down to all successive pages.
This field is used to generate many things in this section: to find the correct icon to display in the left menu, to find the right summary to use in the sectionnav, to pull in the latest release notes for that product, and to identify the correct Hugo menu for the isolated product left menu.