title: What does "async: false" do in jQuery.ajax()?
body: <p>Specifically, how does it differ from the default  ( <code>async: true</code> ) ?</p>
  
  <p>In what circumstances would I want to explicit set <code>async</code> to <code>false</code>, and does it have something to do with preventing other events on the page from firing ? </p>