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With revision marking turned on, you can specify how you want this tool to be used by Excel. If you later want to turn off revision marking, you can display this dialog box again and clear the check box. To turn on revision marking, simply select the check box at the top of the dialog box. Excel displays the Highlight Changes dialog box. This displays a submenu from which you should choose Highlight Changes. You control revision marking by displaying the Review tab of the ribbon and clicking the Track Changes tool. Thus, if you have two workbooks open at the same time, revision marking can be turned on in either, both, or none of the workbooks. Revision marking is turned on or off on a per-workbook basis. It can be used so you can see your own changes over time.
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However, it can also be a valuable tool even if you are the only one using a workbook. Revision tracking is normally meant for use in a shared environment, so you can track how other people may have changed a workbook for which you are responsible. Thus, you can see what has been added, deleted, or simply changed. In a nutshell, Excel allows you to keep track of the changes made to your workbook. If you are a Microsoft Word user, you may already be familiar with what is meant by the term revision tracking.