The ribbon is a set of toolbars at the top of the window in Office programs designed to help you quickly find the commands that you need to complete a task. You'll find some of the things that were previously on the ribbon available now under the File menu, including the Save and Options selections.

There are several ways that you can control the appearance of the ribbon: Auto-Hide Ribbon, Show Tabs, Show Tabs and Commands.

Office 365: Use the Ribbon Display Options button in the lower-right corner of the ribbon and select your choice from the drop down menu.