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Launch Excel and open the workbook you want to protect by clicking on **File** and selecting **Open**.
Click on **File** in the top left corner, then select **Info** from the sidebar options.
In the Info menu, click on **Protect Workbook**. A dropdown menu will appear.
From the dropdown menu, select **Encrypt with Password**. A dialog box will prompt you to enter a password.
Enter your desired password and click **OK**. You will be prompted to re-enter the password for confirmation. After confirming, click **OK** again to finalize the protection.