The Ribbon is the panel at the top of the document. There are nine tabs, and each contain a different set of features that will help you in editing and developing your spreadsheet.
The features in each tab are categorized into related groupings (hereafter referred to as a group), such as Edit, Font, Cells, all found in the Home tab.
The Ribbon can be customized if there are certain features you would prefer to have in the Ribbon over others. This will be discussed later in the tutorial.