Hints - Word - Beyond the ribbon with Backstage view

The Backstage view is where you manage your documents and related data about them — create, save, and send documents, inspect documents for hidden metadata or personal information, set options such as turning on or off AutoComplete suggestions, and more. 

The Ribbon contains the set of commands for working in a document, while the Microsoft Office Backstage view is the set of commands you use to do things to a document. 

Note: The File tab replaces the Microsoft Office Button Office button image and the File menu used in earlier releases of Microsoft Office.