"Attribute hash", what's that?
<p>I am reading <a href="http://documentcloud.github.com/backbone/docs/backbone.html#section-28" rel="nofollow">the annotated source code of backbone.js</a> and it mentions "attribute hash". What is that?</p>

<blockquote>
  <p>Set a hash of model attributes on the object, firing "change" unless you choose to silence it.</p>
</blockquote>

<p>My understanding is it is an object, array, etc, or does hash refers to any format in particular?</p>
