Servlet is very powerful server side scripting language. It is a class which basically handle network request-response model. It is very powerful as we had earlier like CGI.

Basic Request-Rsponse Model

When browser send http request to java web server(like Tomcat, Jeety) then server pass the request to specific servlet , which process the request and perform task and revert response to the browser.

Where Servlet Runs ?

Servlet runs under web server. We can say that servlet container . Example-

1.Tomcat
2.Jeety

Servlet Life Cycle

Servlet follows certain life cycle which is managed by servlet container. Servlet life cycle is as -

1. Servlet Initialization -By calling the init () method.
   

2. Process Request - calls service() method to process a client's request.
   

3. Servlet Termination -The servlet is terminated by calling the destroy() method.
   

4. Finally, servlet is garbage collected by the garbage collector of the JVM.