Had any one of you worked up on callbacks and observers. I tried a lot to understand those topics but some how i could not understand that in to depth. If any one of you have a bit time plzz explain me those.

Hi Guys..

  Had any one of you worked up on callbacks and observers. I tried a lot to understand those topics but some how i could not understand that in to depth. If any one of you have a bit time plzz explain me those.