Definitions of all the ribbon tabs in Microsoft Excel:
1. Home: This tab provides access to basic formatting and alignment tools, such as font, color, and number formatting, as well as clipboard and undo/redo functions.
2. Insert: This tab allows you to insert various elements into your worksheet, including tables, charts, images, shapes, and more.
3. Page Layout: This tab provides options for customizing the layout and design of your worksheet, including page setup, margins, and themes.
4. Formulas: This tab offers tools for working with formulas and functions, including formula entry, formula auditing, and function libraries.
5. Data: This tab provides tools for managing and analyzing data, including data validation, data tools, and external data connections.
6. Review: This tab offers tools for proofing and reviewing your worksheet, including spell checking, grammar checking, and commenting.
7. View: This tab allows you to customize your worksheet view, including zoom, layout, and window management.
8. Developer: This tab (not visible by default) provides tools for developers and power users, including macros, add-ins, and XML tools.
9. Add-ins: This tab (not visible by default) allows you to manage and access add-in applications and tools.
Note: The ribbon tabs and their contents may vary depending on the version of Excel and the user’s settings.
Also, some tabs might be hidden or not available in certain situations, like when working in a specific mode (e.g., Page Layout view) or when using a specific feature (e.g., Pivot Tables)