Learn how to Circle Invalid Data in Excel. We also show you how to remove Invalid Data, and validate and approve the circled data.

A common use of data validation is to create a drop-down list. Use it to restrict the type of data that users enter into an Excel cell.

Learn how to use a data validation control to allow users to select when to run multiple VBA procedures in Microsoft Excel.

The lookup function in Excel can save you a lot of time and effort, but only if you actually know how to use its many forms and alterations.