When you write a post, you can assign tags to help differentiate between categories of content. For example, you might tag some posts with News and other posts with Cycling, which would create two distinct categories of content listed
<ul id="navigation-menu" class="slimmenu">
<li class="has-submenu"><a href="index.html">Home</a>
<ul>
<li><a href="index.html">Home 1</a></li>
<li><a href="index2.html">Home 2</a></li>
</ul>
</li>
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<li class="has-submenu">
<a href="#">Page</a>
<ul>
<li><a href="author.html">Author</a></li>
<li><a href="authors.html">Authors</a></li>
<li><a href="tag.html">Tag</a></li>
<li><a href="tags.html">Tags</a></li>
<li><a href="404.html">404 Page</a>
</ul>
</li>
<li><a href="guide.html">Style Guide</a></li>
<li><a href="contact.html">Contact</a></li>
</ul>