forward()	sendRedirect()
Use  forward() to transfer control to other resources within the same webapp, or to other webapps, for further processing.	Use  sendRedirect() to transfer control to other resources, perhaps on a different server, for futher processing.
When  forward() is called we pass the request and response object so our old request object is present in the new resource which is going to process our request.	sendRedirect() is essentially a new URL.