Explain some code
<p>What is happening in below jQuery code ?</p>

<pre><code>$("#myDiv").val($(".cssValue").sortable('serialize',{expression: 'textExp[#]'}));
</code></pre>

<p>I understand its enabling sortable on a css value within a div, I'm open to correction on this.</p>

<p>I'm confused about this section:</p>

<pre><code>'serialize',{expression: 'textExp[#]'}
</code></pre>
