Safari can use information in your Address Book or data you previously entered in an online form to automatically complete online forms you need to fill out in the future. AutoFill () is a service that helps you complete online forms and log in to Web sites with a user name and password. You use the AutoFill pane of the Safari preferences to select, modify, or delete which information AutoFill uses to complete a form or log in. When you use AutoFill to automatically fill in information, Safari highlights the data in yellow so you can see the changes. If you no longer need the AutoFill service, you can keep Safari from automatically completing forms and log ins.