"Anna Karenina" is a novel written by Leo Tolstoy, first published in 1877. The story revolves around Anna Karenina, a married woman who embarks on a passionate affair with Count Alexei Vronsky. Set in 19th-century Russia, the novel explores themes of love, infidelity, and the constraints of society. The narrative also follows other characters, such as Konstantin Levin, who struggles with his own romantic and existential dilemmas. Through these intertwined stories, Tolstoy examines the complexities of human relationships and the impact of societal expectations on personal happiness.