In a large workbook, you might create many different worksheets. Why not? Individual worksheets make good sense. They allow you to organize your data on separate sheets. The workbook in Figure 4.14 is a good example for separate sheets; the first worksheet holds the total vacation days and total sick days for each employee, and each monthly worksheet tracks the time by days and hours.
You can add or delete as many worksheets to a workbook file as you want. By default, Excel names the sheets with a number. The name is displayed on the worksheet's tab. Most times, the names Sheet1, Sheet2, and so on aren't descriptive of the sheet's purpose; you can easily change the sheet names to be more descriptive.