JSP are java server pages which constitute of html pages 
embedded in it ie it is useful for both presentation and 
application/business logic..It is compiled only once and 
each time it is not executed by server..While servlet are 
server side programs which are compiled  and is executed
each time..

jsp means java server page ,jsp is  laso a servelt .In the 
servlet code is written by manually but in jsp code is 
generated by the jsp container. 
jsp is used where the presentation layer is more, and  this 
is uesd in medium and larger projects
servlet is used in small projects

adv:
 1. jsp can be devolp easly.
 2. jsp will take less time.
disadv:
  1. it can accupi the more memory(why because it fallow 
structural procedure menas by genearting the servlet code 
included unnecessry content also)

>Servlets are gud at running logic.
>not so gud at producing large amount of o/p.

>Not so gud at lots of logic.
>g8 ay producing lots of texual o/p.

Jsp is defined as Java server pages. 
Jsp and servlet both are server side programming language. 
the diffence in b/w these two is Jsp is used for 
presentation part and servlet is use to give the business 
logic. 
Servlet act as redirector also. it redirect your page as 
per the business logic. 

anyhow Jsp are compiled to servlet but Jsp comes in to 
picture to separate out the presentation logic from the 
servlet to make it loosely coupled.