About JSP/Servlet

Java Server Pages (JSP) is a technology that lets users mix regular, static HTML with dynamically-generated HTML. Many Web pages that are built by CGI programs are mostly static, with the dynamic part limited to a few small locations; but most CGI variations, including servlets, make users generate the entire page via their program, even though most of it is always the same. JSP allows users to create the two parts separately.[13]

Servlets are Java technology's answer to CGI programming. They are programs that run on a Web server and build Web pages.[13]