jQuery $(this) keyword

Question

Why is it important to use $(this) instead of re-selecting the class?

I am using a lot of animate and css editing in my code, and I know I can simplify it by using

Answer 1

$(document).ready(function(){
   $('.somediv').click(function(){
   $(this).addClass('newDiv'); // this means the div which is clicked
   });                         // so instead of using a selector again $('.somediv');
});                           // you use $(this) which much better and neater:=)