The evolving term graphic novel is not strictly defined, and is sometimes used, controversially, to imply subjective distinctions in artistic quality between graphic novels and other kinds of comics. It suggests a story that has a beginning, middle and end, as opposed to an ongoing series with continuing characters; one that is outside the genres commonly associated with comic books, and that deals with more mature themes. It is sometimes applied to works that fit this description even though they are serialized in traditional comic book format