What is a different between $(this) and this in jQuery

By December 24, 2011 Jquery

$(document).ready(function(){
    $('#Valuediv').mouseout(function(){
       alert($(this).text());
  });
});

$(document).ready(function(){
    $('#spnValue').mouseover(function(){
       alert(this.innerText);
  });
});

In first example $(this) is a jQuery object here you are using  power of jQuery
and In Second example  ‘this‘ keyword, means you are using native JavaScript code.