When you share an Excel workbook, multiple users can open it at the same time and see each other's changes almost immediately. This is a great way to collaborate on a project, or to get feedback on a workbook before sending it off to someone. There are a few different ways to share an Excel workbook:
If you plan to continue working on the shared workbook after sending it, be sure to save a copy for yourself first. Otherwise, any changes you make will be overwritten when you save your changes.
If you're not sure whether everyone who needs to edit the workbook has Microsoft Office installed on their computer, consider using OneDrive or SharePoint instead of sharing via email. That way, they can edit the workbook using Office Online, which doesn't require Microsoft Office.