Links are simply words or phrases which have been highlighted in some way. They can be blue, underlined or some other color. Links do not have to be underlined. In fact, many people find it easier to read a page if the links are not underlined. But, links must be highlighted somehow. Links can be anywhere on the page… even on the sidebars, headers, and footers. They can be one or two lines of text, a graphic, an image, or whatever. The important thing is that users should be able to tell they are links.