The Featured Banner displays a box with a link and text placed on top of a background. Until the current version the user cannot upload an image as a background of the view, so they have to use it either in a Landing Page section or to set the background manually using the CERN Override theme.
The Horizontal Boxes view display format is one of the most used in the home website. If you have browsed in the home website, you probably have noticed specific views that load as carousels of boxes. These views are created using the Horizontal Boxes display Format.