Visual Designers are the canvases that you work on using the mouse to create items such as forms via drag, drop, move, resize, and the like. Visual Studio 2015 ships with many such visual designers. Together, they enable you to build the items that make up your application. Items include Windows forms, web forms, class diagrams, XML schemas, and more.
All the visual designers work in a similar way. First, they take center stage within the IDE as tabbed windows surrounded by various menus, toolbars, and panes. Second, you use the Toolbox (discussed in a moment) as a palette from which you place items (such as controls) onto the given designer. You then configure each item’s many properties using the Properties window.