title: Defining variables in jQuery
body: <p>Can someone explain the difference between using a $ when defining variables in jQuery and not. Does it have any impact on performance?</p>
  
  <pre><code>var $someVar = $("a");
  var someVar = $("a");
  </code></pre>
  
  <p>Also, what is the difference in calling variables with and without $(someVar) For example:</p>
  
  <pre><code>$(someVar).html();
  someVar.html();
  </code></pre>