The Scarlet Letter is a novel written by Nathaniel Hawthorne, published in 1850, that explores themes of sin, guilt, and redemption in a Puritan society. The story follows Hester Prynne, a woman shunned by her community for bearing an illegitimate child, and the scarlet letter 'A' she is forced to wear as a symbol of her shame. The novel reflects Romantic ideals through its focus on individualism, emotion, and the complexity of human morality.