The 19th century was a transformative period for theatre, marked by significant social and technological changes. Romanticism, Realism, and Naturalism emerged as major movements, influencing playwriting and performance styles. The rise of the middle class expanded theatre audiences, while innovations in lighting and stagecraft enhanced productions. Influential playwrights like Ibsen, Chekhov, and Shaw tackled social issues, challenging societal norms. Actor training evolved with Stanislavski's system, emphasizing emotional truth and psychological realism. Independent theatre movements and experimental companies paved the way for avant-garde theatre, leaving a lasting impact on modern theatrical practices.