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The quickest way to do this is to double-click its file name. It’s at the top-left corner of the window (or in the menu bar on a Mac).    Follow the on-screen instructions to type and confirm the password that will protect your document. Click the File menu and select Save to save the new version of your document. Now that the file is password protected, you can send it in a variety of ways:  Attach the document to an email message in Gmail, Outlook, or Mac Mail. Add the file to a cloud drive like Google Drive, iCloud Drive, or Dropbox.
Open the document in Microsoft Word. Click the File menu. Click Info. Click Protect Document. Click Encrypt with Password. Create and confirm the document password. Save the file. Share the document with others.