The ribbon is a palette that displays task-based tools and controls.
The ribbon is divided into tabs, with each tab is supporting a specific activity. Within each tab, tools are grouped together into a task-based series of panels. Some of the tabs are contextual. When you execute some commands, a special contextual ribbon tab is displayed instead of a toolbar or dialog box. For example, as soon as you start selecting items in the Scene View, the previously hidden Item Tools tab appears. When nothing is selected, it becomes hidden again.
You can customize the ribbon depending on your needs in the following ways:
You can use floating panels. If you pull a panel off of a ribbon tab and into a different area in the application window or the desktop, that panel floats where you placed it. The floating panel remains open until you return it to the ribbon, even if you switch ribbon tabs.