Q)What are the different servlet scopes?
    =>Whenever a client request is a complex request, request processing
    may involve multiple servlets or the client requesting multiple times.
    In such cases, a servlet should be able share data among multiple
    servlets.
    =>Whenever data sharing in a web application is the requirement, we
    will have the concept called "servlet scopes".

    =>there are 3 servlet scopes.

                1)request scope
		2)session scope
		3)application scope

   =>If data is stored in request object, it is said to be in request scope.

   =>If data is stored in HttpSession object, it is said to be in session scope.

   =>If data is stored in ServletContext object, it is said to be in application scope.

Q)How many ServletContext objects are created?
   =>One per web application.
   =>As soon as the Java web application is deployed, Servlet Container creates
   ServletContext object.
   =>ServletContext object is available to all the servlets of the application.
   =>ServletContext object is destroyed only when the application is undeployed
   or the server is shut down.

Q)How many request objects are created?
   =>One per client request.
   =>request object is created when the client request is received.
   =>Once request-response cycle is over, request object is destroyed.

Q)Explain about MVC architecture.
     =>A Java web application contains 3 different logics

               1)flow control logic(application loigc)
	       2)data accessing and data processing logic
	       3)Presentation logic(output generation logic)

=>In MVC(Model, View, Controller) architecture of attending a client request,
          =>data accessing and data processing logic are implemented in
	   a Java object known as Model.

          =>Model is divided into two components.

	             1)Business Component(service Object)
		     2)Data Access Object

 => Flow control logic(application logic) is implemented 
 in controller.
 =>A servlet acts as a controller as per MVC architecture.

=>What user sees is view. View Component produces the view
for the users. In a Java web application, a jsp is used as a view component.

MVC Diagram

1:- controller receiving the client request

2:- controller asks the model for processed data

3:- Model gives processed data to the controller

4:- controller swithing the control to the view component

5:- view component producing the response page for the client