Isabel Archer is the main character in the novel "The Portrait of a Lady," written by Henry James. She is an intelligent and independent young American woman who travels to Europe in search of personal freedom and self-discovery. Throughout the story, Isabel grapples with her choices and the expectations placed upon her by society. As the narrative unfolds, Isabel faces various challenges, including romantic entanglements and the influence of wealthy suitors like Gilbert Osmond. Her journey reflects themes of autonomy, identity, and the complexities of human relationships, making her a compelling figure in literary history.