Access 2010 Tour: The User Interface
By Mike Chapple, About.com Guide
The command tabs help you navigate through the Ribbon by choosing the high-level task that you'd like to perform. For example, the Ribbon shown above has the Create command tab selected. The Home, External Data and Database Tools command tabs always appear at the top of the Ribbon. You'll also see context-sensitive tabs, such as the Datasheet tab in the example above.