Explanation:
By default, a Microsoft Excel 2016 workbook contains one worksheet.

Workbook and Worksheet:
In Microsoft Excel, a workbook is a file that contains one or more worksheets. Each worksheet is a grid of cells organized into rows and columns. It is used for various purposes like storing data, performing calculations, creating charts, and analyzing information.

Default Number of Worksheets:
When you create a new workbook in Microsoft Excel 2016, it is created with one worksheet by default. This means that when you open a new workbook, you will see one blank worksheet ready for you to start entering data or performing operations.

Adding or Deleting Worksheets:
Although a new workbook has only one worksheet by default, you can easily add or delete worksheets as per your requirements. To add a new worksheet, you can click on the plus sign (+) next to the existing worksheet or use the shortcut Ctrl + Shift + N. To delete a worksheet, you can right-click on its tab and select "Delete" or use the shortcut Ctrl + Shift + F9. It is also possible to rename worksheets to give them meaningful names that reflect their content or purpose.

Worksheet Tabs:
Worksheets in Excel are displayed as tabs at the bottom of the Excel window. Each worksheet tab has a name, which can be changed to provide a descriptive title for the data or analysis contained within that worksheet. You can use the worksheet tabs to switch between different worksheets in a workbook.

Conclusion:
By default, a Microsoft Excel 2016 workbook contains one worksheet. However, you can add or delete worksheets as needed to organize your data and perform various tasks in Excel.