Difference between $(this).find("li") and $("li", $(this))
<p>While creating a jQuery plugin I find many uses of</p>

<pre><code>var obj = $(this);     
$("li:even", obj)
</code></pre>

<p>to select the current Item. How does this work? Because while writing jQuery snippets I used to write </p>

<pre><code> $(this).find("li");
</code></pre>

<p>Can someone explain for better understanding? Reference to this code is <a href="http://www.queness.com/post/112/a-really-simple-jquery-plugin-tutorial/page/2#comments" rel="nofollow">here</a>.</p>
