A MultiPage is a control that contains a collection of one or more pages.
Each Page of a MultiPage is a form that contains its own controls, and as such, can have a unique layout. Typically, the pages in a MultiPage have tabs so the user can select the individual pages.
By default, a MultiPage includes two pages, called Page1 and Page2. Each of these is a Page object, and together they represent the Pages collection of the MultiPage. If you add more pages, they become part of the same Pages collection.