Heidi is a classic work of children's fiction written by Swiss author Johanna Spyri, originally published in two parts as Heidi: Her Years of Wandering and Learning and Heidi: How She Used What She Learned. It is one of the best-selling books ever written and is among the best-known works of Swiss literature. It was written as a book "for children and those who love children". The key points of the novel are as follows: . Originally written in German, Heidi was later translated into more than 50 languages. . Its popularity rests, in part, on the heartwarming story, as well as Spyri's vivid descriptions of the mountain pastures, Grandfather's cabin, and Heidi's simple life. . The novel lets children be children, away from the restraints of adult rules.