Here's how to save your Excel workbook as a different file type, like a CSV (Comma-Separated Values) file:

1. Open your workbook: Make sure the Excel workbook you want to save in a different format is open.
2. Go to File: Click on the "File" tab in the top left corner of the Excel window.
3. Select Save As: In the "File" menu, choose the "Save As" option.
4. Browse to your save location: A dialog box will appear. In the "Save As" type box, navigate to the folder where you want to save the converted file.
5. Choose the file format: Click the dropdown arrow next to "Save as type." You'll see a list of different file formats Excel can save in.
6. Select CSV Format: For saving as a CSV file, choose the option relevant to your needs. Here are two common choices:
- CSV (Comma delimited): This is the most common CSV format, separating values with commas.
- CSV UTF-8 (Comma delimited): This format uses UTF-8 encoding, which can handle a wider range of characters compared to standard CSV. Choose this if you have special characters or international characters in your data.
7. Name your file (Optional): In the "File name" box, you can enter a new name for your saved file if you wish. By default, it will likely use the original filename with the new extension.
8. Click Save: Once you've chosen the file format and location, click the "Save" button to save your workbook as the selected file type (e.g., .csv).

Important Notes:

* Saving as a CSV file will remove most formatting from your Excel workbook. For instance, font styles, cell colors, and borders won't be preserved in the CSV file.
* CSVs are plain text files suitable for transferring data between different programs that can read CSV formats. They are not ideal for complex data with formatting or formulas.