By default, text hyperlinks are displayed underlined in blue, active links are displayed underlined in red, and visited links are displayed underlined in purple.
Alternatively, for each page in your site you can override the defaults and specify how each style of link is displayed.

The color of the links will change to reflect the Normal color you have specified.
In addition, if your output option is HTML 4.01 or XHTML you can define CSS link styles.
For example, if you want to change the link to red italic when the mouse pointer is over it:

The appearance of the links will change to reflect the Normal style you have defined.