Your iPhone's spell-checking feature automatically adds a red underline to any word that doesn't exist in its dictionary. The underline is purely cosmetic, and the feature is intended to be helpful.

Some of the most common tasks performed when you're editing a document on paper may not be so obvious when you're staring at a computer screen. As you review Word 2007 documents, share your comments ...

How to control a hyperlink’s appearance in Microsoft Word Your email has been sent Hyperlinks are a part of our everyday lives—we readily recognize the underlined blue font as a link to related ...