When can we use forward and when can we use sendRedirect?

What is the difference between sendRedirect and forward in java?

forward	SendRedirect
Control can be transferred within the server	Control can be transferred to the other server also
The request and response objects are transferred with the forward	Request and response objects are not transferred with the sendRedirect
In case of forward URL is not refreshed	In case of sendRedirect the URL is refreshed
No new request is generated	New request is generated
Session is not lost in forward	Session is not lost in sendRedirect also

Where to use and where to use sendRedirect?

sendRedirect can be used in two scenarios

1. You want to transfer control to resource on different server.
2. Where you want to separate tasks as Do the PaymentProcess and then redirect to displayPaymentInfo. If the client refreshes the browser only the displayPaymentInfo will be done again and PyamenProcess will not be repeated..

In all other cases Forward wil serve the purpose.