Opening a file retrieves it from storage and displays it on your computer screen.
To open an existing workbook:
Closing a workbook removes it from your computer screen and stores the last saved version for future use. If you have not saved your latest changes, Excel prevents you from losing work by displaying a dialog box that asks if you want to save the changes you made before closing. You must click one of the three options in the dialog box before Excel will close the workbook.
To close a workbook and save your latest changes:
To open a workbook, you can also:
To close a workbook, you can also: