Confusion between the use of JSP

I read that JSP are used for presentation and servlets for writing business logic . But the jsp are themselves converted into servlets. Then why we are we using jsp if they are converted back into servlets again.

The fact that JSPs leverage servlets is an implementation detail. It should in no way affect how they are used.

Yes... JSP was brought for Presentation Logic... And writing Business Logic in Servlets is a bad design... Then, that business logic cannot be re-used. Servlets makes the decision of redirection to other pages based on the condition.

JSP is basically a Servlet which has the life-cycle of initialization, servicing the request and destroyed...