Batman is a fictional comic book superhero created by Bob Kane and Bill Finger. He first appeared in Detective Comics #27 in 1939 and has since appeared in publications by DC Comics. Batman operates in Gotham City, fighting villains like the Joker and Penguin without superpowers through intellect, detective skills, technology, martial arts, and fear. His secret identity is Bruce Wayne, an American billionaire who witnessed his parents' murder as a child and trains himself to fight crime.