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jsp:forward action tag:
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This forward action tag internally uses requestDispatcher.forward(request, response) method to forward the request to the destination program of the Source jsp program.

In this process, the HTML output of the entire source JSP program is discarded, and only the HTML output of the destination JSP/Servlet is sent to the browser window.

Refer Fig: jsp forward action tag

Here entire HTML out of source jsp program (Source.jsp) will be discarded and only the HTML output of desitnation.jsp program goes to browser window as response.

In jsp forward action , here separate JSP equivalent servlet classes will be generated for both Source.jsp and Destination.jsp pages.

There is no directive forward tag available in JSP tech. whereas jsp offers action forward tag i.e. jsp:forward page ="destination_URL" /

Taking a request from a client and processing that request by using multiple web resource programs that there are in chaining /communication is called "resource chaining".

To perform servlet chaning (Servlet to servlet communication) we need requestDispatcher.forward(req, res) method and requestDisapatcher.include(req, res) methods.

To perform JSP chaning (JSP to JSP communication) we need jsp:forward and response.sendRedirect(requset, response) methods.

The web resource programs that are their in chaning will use the same request, response object.