Naturalism is a literary movement beginning in the late nineteenth century, similar to literary realism in its rejection of Romanticism, but distinct in its embrace of determinism, detachment, scientific objectivism, and social commentary. Literary naturalism emphasizes observation and the scientific method in the fictional portrayal of reality. Naturalism includes detachment, in which the author maintains an impersonal tone and disinterested point of view; determinism, which is defined as the opposite of free will, in which a character's fate has been decided, even predetermined, by impersonal forces of nature beyond human control; and a sense that the universe itself is indifferent to human life. The novel would be an experiment where the author could discover and analyze the forces, or scientific laws, that influenced behavior, and these included emotion, heredity, and environment. The movement largely traces to the theories of French author Émile Zola.

Literary realism is a literary genre, part of the broader realism in arts, that attempts to represent subject-matter truthfully, avoiding speculative fiction and supernatural elements. It originated with the realist art movement that began with mid-nineteenth-century French literature (Stendhal) and Russian literature. Literary realism attempts to represent familiar things as they are. Realist authors chose to depict every day and banal activities and experiences.