You can add custom tabs or rename and change the order of the default tabs that are built in to Office. Custom tabs in the list have (Custom) after the name, but the word (Custom) does not appear in the ribbon. To work with your ribbon, you need to get to the Customize the Ribbon window. Here's how you do that. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.