Like the attribute tags, the anchor tag must be both turned on and turned off. The text that is linked appears between the on and off tags. The URL describes the type of file and the file's location by server name and filename. The highlighted color indicates a link. When your readers click on it they go to the file described by that link.
Most browsers are, by default, configured to underline links as well.
The href switch is the most important. Type the URL to which you want to link as the value for the href switch. If you are sending mail, use the email address instead of the server and filename. The target switch lets you display the linked file within a specific window. Unless you are working with a feature called Frames or want to create a new browser window, you won't need to worry about this switch.