By customizing ribbon panels, you can organize commands that you use frequently similar to toolbars. With ribbon panels, you can quickly access commands, and reduce the number of user interface elements that are displayed.
Commands and controls are added to and organized with rows and sub-panels on a ribbon panel.
Drop-downs can be used to group multiple related commands into a single button.
You can add, remove, and relocate ribbon panel controls, such as drop-down lists, sliders, text boxes, and other types of panel-specific controls that start commands or change a setting. For example, the Home 2D/3D - Layers panel contains controls for working with the layers of a drawing.