Are sequels canon?

Do you believe in sequels? Exceptions being things like LotR, is it generally possible that no sequel is ever canon?

There does seem to be irrefutable evidence that sequels do, indeed, exist. Whether or not they should exist is another matter. I think Lord of the Rings was just too long to make in one go, it’s more a case of episodes than sequels.

Do you think that sequels should exist? Like Terminator 2, or The Mummy Returns?