The ribbon is a toolbar element which is always shown on the top of the application window. It is a combination of a classic menu with an application toolbar. The ribbon contains two different types of ribbon tabs. The first type is always visible (e.g. Home) and allows access to functions which are present independently of the selected object in the application. The other type (contextual tab) appears only if you select a specific user interface element.
The navigation pane is the area at the left of the application. It consists of a title bar, a navigation tree that may contain additional sections, and the view selection buttons. Additional sections are, for example, the signal selector and the method selector. The layout and purpose of the navigation tree depend on the selected view. Under Data Processing the navigation tree is called injection tree and contains all loaded data.
The workspace is the area in the user interface where the different windows are shown. A window can have a specific toolbar.