Text can include a certain limited subset of HTML. (The subset was selected to remain safe from cross-site scripting attacks.) This is useful for creating links:
You might want to link to
<a href="http://jboss.com/products/seam">something cool</a>,
or even include an image: <img src="/logo.jpg"/>
And for creating tables:
<table> <tr><td>First name:</td><td>Gavin</td></tr> <tr><td>Last name:</td><td>King</td></tr> </table>