Links have an additional set of attributes beyond regular text.
You can specify the default style for links at the page-level or right on the individual link itself. Normally links are underlined and have a color. Some sites include the HOOVER option so that the color or style changes when the mouse is over the link. MidrangeNews.com uses this technique.
The HOOVER option is only if you want your site to really suck...
HOVER not HOOVER. Hoover is for damns and sweeping floors.
Damns is cussing. Dams are for holding back water.
And on top of sweeping floors they also do air purifying.