Naturalism is a literary genre that started as a movement in late nineteenth century in literature, film, theater, and art. It is a type of extreme realism. This movement suggested the roles of family, social conditions, and environment in shaping human character. Thus, naturalistic writers write stories based on the idea that environment determines and governs human character.
We also see use of some of the scientific principles in naturalistic works, and humans struggling for survival in hostile and alien society. In fact, naturalism took its cue from Darwin’s theory of evolution, which holds that life is like a struggle and only the fittest survive.