A JSP page is "transleted" into java code which is
then compiled into a servlet. You can write a servlet
in java code and compile it yourself.

short answer - not a lot - jsp  compiles to a servlet.
longer answer - you would tend to use jsp when you have some (html or
other) display component
but not necessarily so, you can do anything with jsp that you can do
with a servlet and more.
jsp's do tend to be easier to find on a server
(the url doesn't have to have /servlet/ in it or be specifically mapped
to somewebapp url space)
a jsp usually lives with the html content of your webapp........

IMHO,When your page is more of HTML and less computation, then it is
better to use JSP and Vice-versa. Another advantage is, you cld use
WYSWYG editors to create JSP, I like that option as it is easy to
design pages that way.

the very basic difference is
servlet-html in java
jsp-java in html

servlet: its a java class so for every change we have to
compile the code to reflect the change.Mainly using for
writing business logics.

jsp:its a file, its automatically converted into a servlet
on deploying. We can’t compile it explicitly.the changes
will get reflect by saving the file.Its mainly used for
presentation of data.....