title: In Javascript/jQuery what does (e) mean?
body: <p>I am new to JavaScript/jQuery and I've been learning how to make functions. A lot of functions have cropped up with (e) in brackets. Let me show you what I mean:</p>
  
  <pre><code>$(this).click(function(e) {
      // does something
  });
  </code></pre>
  
  <p>It always appears that the function doesn't even use the value of (e), so why is it there so often?</p>