Naturalism is an artistic style, especially literary, based on reproducing reality with perfect objectivity and documentary in all its aspects, in the most sublime as the most vulgar. Its leader, theoretician and promoter Émile Zola was the journalist who exposed this theory in the preface to his novel Thérèse Raquin and especially in Le Roman expérimental (1880). From France, Naturalism was spread throughout Europe during the next twenty years adapting to the different national literatures. Naturalism has no will to humans, determined by heredity and environment in which they live.