The smartest thing Excel does happens in places you can't see.

Microsoft Excel's Data Validation tool lets you add a drop-down list to a cell based on existing data in a column. However, how this works depends on whether the source data is part of a formatted ...

Microsoft Excel’s Subtotal feature is a great tool, but you can make the results even better by customizing the format. Microsoft Excel’s Subtotal feature calculates subtotals and a grand total for ...