It is possible to modify Excel’s default blank workbook; you can even modify the default new worksheets that you insert into your existing workbooks.

Unhiding Excel sheets is easy, but can be tedious. Use this simple macro to unhide all hidden sheets in an Excel workbook.

The workbook is the file that contains all of the elements of your Excel spreadsheet. Don't confuse a workbook with a worksheet in Excel-the worksheet is an element of a workbook.