The Tin Man is a fictional character from The Wonderful Wizard of Oz (1900) and related books by American author L. Frank Baum. The character is called the Tin Woodman in the books but is popularly known as the Tin Man. He is made entirely of metal and has no working internal organs, although he can speak. His tin body renders him vulnerable to rusting when he is exposed to moisture of any sort. He desires a heart and joins Dorothy Gale, the protagonist of The Wonderful Wizard of Oz, on her journey to the City of Emeralds to ask the Great Wizard Oz for one.

Source: Britannica