Final answer:
The Ribbon is the part of the Excel screen where you can find all the commands or buttons, depending on the tab you selected before.
Step-by-step explanation:
The part of the Excel screen where you can find all the commands or buttons, depending on the tab you selected before is called the Ribbon. The Ribbon is located at the top of the Excel window and is divided into multiple tabs, such as Home, Insert, Page Layout, Formulas, Data, etc. Each tab contains a variety of commands and buttons that are relevant to the specific tasks you want to perform.