Servlets are server side components that provides a powerful mechanism for developing server web applications for server side. Earlier CGI was developed to provide server side capabilities to the web applications. Although CGI played a major role in the explosion of the Internet, its performance, scalability and reusability issues make it less than optimal solutions. Java Servlets changes all that. Built from ground up using Sun's write once run anywhere technology java servlets provide excellent framework for server side processing.
Using servlets web developers can create fast and efficient server side applications and can run it on any servlet enabled web server. Servlet runs entirely inside the Java Virtual Machine. Since the servlet runs on server side so it does not depend on browser compatibility.
Servlets have a number of advantages over CGI and other API's. They are:
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