The Picture of Dorian Gray is a novel by Oscar Wilde that explores the themes of decadence and the pursuit of pleasure. Set in the late 19th century, the story follows the life of Dorian Gray, a young man who remains eternally youthful while a portrait of him ages and reflects the consequences of his immoral actions. Wilde's witty writing style and sharp social commentary make this book a classic of fin-de-siècle literature.