To get an idea of how these blue bordered automatic navigations work, think of a single-parent family tree and call it page hierarchy. Every page created or managed using such navigations automatically becomes a direct or indirect descendant of the origin page and can have any number of sibling or child pages. The origin page is called “root” in the Web Builder, and since pages are content objects, the root actually is the root object, which most often represents the website’s homepage.
Now, if you take another look at the above navigation, picture its items as children of the root page. The Web Builder allows developers to insert such automatic child list navigations anywhere on the website, and, in this case, the parent used is the root page.