"OZ" refers to the fictional land created by author L. Frank Baum in his classic children's book, "The Wonderful Wizard of Oz," published in 1900. The story follows a young girl named Dorothy who is swept away by a tornado from Kansas to the magical land of Oz. There, she meets various characters, including the Scarecrow, Tin Man, and Cowardly Lion, as she seeks to return home. The land of Oz is divided into different regions, each ruled by a Wicked Witch or a good witch, such as Glinda. The narrative explores themes of friendship, courage, and self-discovery, making it a beloved tale that has inspired numerous adaptations, including films, stage productions, and merchandise.