Hi sirisha
redirect means the control will goes to anothre url for example mailcity.com is one famous site that will be purchesed by lycos.com when ever the user login to the mailcity.com the request will goes to lycos or it will give status code as 302.requestdispatcher will have two methods include() & forward(),In forward the control will goes to another jsp,and in include just we will include jsp.
thanks,
vishnu.