Heidi (/ˈhaɪdi/; German: [ˈhaɪdi]) is a work of children's fiction published in 1881 by Swiss author Johanna Spyri, originally published in two parts as Heidi: Her Years of Wandering and Learning (German: Heidis Lehr- und Wanderjahre) and Heidi: How She Used What She Learned (German: Heidi kann brauchen, was sie gelernt hat). It is a novel about the events in the life of a young girl in her paternal grandfather's care in the Swiss Alps. It was written as a book "for children and those who love children" (as quoted from its subtitle).Heidi is one of the best-selling books ever written and is among the best-known works of Swiss literature.
At the solicitation of many friends I am publishing, unknown to my daughter, these letters written by her while in the service of the Y.M.C.A. The letters have come to me scribbled in lead pencil and in every color of ink upon an assortment of stationery that in itself revealed the snatching of whatever opportunity to write occurred in a busy life.