forward vs include

Both forward() and include() are concrete methods of the RequestDispatcher class in the Servlet context.

forward() - this method is used to show a different resource in place of the servlet originally requested. This resource may be a jsp, a servlet etc. When a request is sent from the client to the web server through an url , the web container intercepts the request and sends it to another resource without the knowledge of the client browser. And a response is received from that resource after processing of the request is done.

include() - this method is used to tag in the contents of a resource as a part of the response flow as if it were part of the calling servlet. If you include a jsp or a servlet, it must not attempt to change the response status code or the http headers, as any such request will be ignored.