Frustrated Web visitors will exit your site even more quickly. Links are your Web sites' signposts. They should give visitors easy visual clues to the site's navigation paths. Most visitors have certain set expectations about links' look and function. They may have problems with sites that don't conform to those expectations.
Visitors expect links to be underlined.
Never, ever use underlined text on your Web page. Underlining is an important visual cue of a hyperlink. If you need to emphasize text, use different text colors, bold, or italics - never underline it. Visitors expect consistent link colors. Unvisited links should be blue .