Realism and Naturalism emerged in the mid-19th century as reactions against Romanticism. These literary movements aimed to depict life accurately, focusing on ordinary people and social issues. They were influenced by scientific advancements and rapid industrialization. Key authors like Flaubert, Zola, and Twain used detailed descriptions, vernacular language, and psychological analysis to create authentic narratives. These works often explored themes of class struggle, gender roles, and the impact of heredity and environment on human behavior.