Servlets are used to develop dynamic webcontent ie
WebApplications Servlets are normal
java classes Who generally have to extend
javax.servlet.http.HttpServlet class.
These are precompiled classes. (This is nothing but a Servlet Template)
Instead in a JSP java code is embedded in HTML for easier Page generation
as HTML code generation in Servlets could be very tedious if the HTML
data is large.
At Runtime the JSP/Servlet container converts the JSP into a Servlet and
executes it.
Regards
Satish