"The Wonderful Wizard of Oz" is a children’s book written by L. Frank Baum and first published in 1900. On the long journey to the Emerald City, Dorothy and Toto are joined by the Scarecrow, who wishes he had brains; the Tin Woodman, who longs for a heart; and the Cowardly Lion, who seeks courage. They face many trials along their route, but they overcome them all, often because of the Scarecrow’s good sense, the Tin Woodman’s kindness, and the bravery of the Cowardly Lion.

Source: Encyclopedia Britannica