The 'Lost Generation' refers to a group of American writers who came of age during World War I and established their literary reputations in the 1920s, many of them as expatriates in Paris. The term was popularized by Ernest Hemingway, who used it as an epigraph for his novel 'The Sun Also Rises,' attributing it to Gertrude Stein. These writers, including F. Scott Fitzgerald, T.S. Eliot, and Ezra Pound, felt disillusioned by the senseless slaughter of the war and the materialistic 'Roaring Twenties.' Their work often explored themes of decadence, gender roles, and the search for meaning in a broken world. Hemingway’s 'Iceberg Theory'—a writing style where the deeper meaning of a story is not on the surface but implicit—became a hallmark of the era. The Lost Generation's output defined modern literature, moving away from 19th-century romanticism toward a more sparse, cynical, and realistic portrayal of the human experience.