Text may even include a certain limited subset of HTML (don't worry, the subset is chosen to be safe from cross-site scripting attacks). This is useful for creating links:
You might want to link to <a href="https://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>
But you can do much more if you want!