In general you do not want to remove the underline formatting from links. Underlining links is the principal way users quickly identify clickable links on your page. There are some cases, like links in menus, where it may be appropriate to remove the underline styling.

x-smallRemoving the underline from links makes them difficult for users to visually find on the page.

Source Code

a:link {text-decoration:none;}
a:visited {text-decoration:none;}