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)