Answer
Miss Maudie reveals to Scout that Arthur "Boo" Radley was a kind and polite boy who came from a good family, but was mistreated by his father and eventually became a recluse. This information is important to the themes of the novel because it highlights the destructive nature of prejudice and the importance of empathy and understanding. It also adds depth to the character of Boo Radley and challenges the children's initial perception of him as a monster.