When there isn't an active market for the forward contract. Generally, Futures contracts have a much more active open market than forward contracts and have alot more choice in terms of expiration months than forward contracts.

1) forward contract is not standardised one..it is only traded in OTC(over the counter)

where as future contract is a standardised one it is traded in Secondary Market

A contract to deliver a particular commodity to a buyer sometime in the future.

An equity roll forward allows an investor to maintain the investment position of a contract beyond its initial expiration. This occurs shortly after the initial contract ends.

An equity roll forward allows an investor to maintain the investment position of a contract beyond its initial expiration. This occurs shortly after the initial contract ends.