Protecting your Excel workbook with a password can help to prevent other people from opening or modifying your workbooks, especially those containing sensitive or confidential information. Here's how you can do this in a few simple steps: 1. **Open Excel Workbook**: Start by opening the Excel workbook that you want to protect. 2. **Go to File**: Click "File" on the top left corner of the Excel workbook window. 3. **Protect Workbook**: In the File menu, click on "Protect Workbook", usually found in the "Info" section. 4. **Encrypt with Password**: Select "Encrypt with Password" from the drop-down menu. 5. **Enter Password**: A small window will appear prompting you to type in a password. Create a strong password that you can remember, enter it into the field, and click "OK". 6. **Confirm Password**: Excel will ask you to re-enter your password for confirmation. Enter the same password again, then click "OK." 7. **Save Workbook**: Finally, don't forget to save your workbook. Your Excel workbook is now password protected. It's important to note that if you forget your password, Microsoft cannot retrieve it for you. Be sure to keep your password in a secure place that you will remember. In addition, please consider the strength of your password. If it's too simple, malicious individuals can potentially crack it. Try to include a combination of uppercase, lowercase, numbers, and special characters to make your password secure. Remember that password protection alone does not secure the contents of the workbook. If you wish to make the content of the workbook secure, you might want to consider encryption solutions or securing the whole file system instead. This process only ensures that unauthorized users will not be able to open or modify your workbook disregard password. These instructions apply to Excel 2010 and newer versions. If you're using an older version, the steps might vary slightly. The key here is to find the Protect Workbook feature and the steps should be relatively similar. Please remember to be aware of any regulatory requirements or policies in your company or industry relating to password use and document security.