American comic book Kane and Bill Finger created Batman, who debuted in "Detective Comics" #27 (1939). The period from the late 1930s through roughly the end of the 1940s is referred to by comic book experts as the Golden Age of comic books. It featured extremely large print-runs, with "Action Comics" and "Captain Marvel" selling over half a million copies a month each; comics provided very popular cheap entertainment during World War II especially among soldiers, but with erratic quality in stories, art, and printing. In the early 1940s over 90 percent of girls and boys from seven to seventeen read comic books.
Superhero fiction actually created the central and supporting characters; Shuster, as the artist, designed these characters, and gave Superman the first version of his now-iconic uniform.) The character possessed many of the traits that have come to define the superhero: a secret identity, superhuman powers and a colorful costume including a symbol and cape. His name is also the source of the term "superhero," although early comic book heroes were sometimes also called mystery men or masked heroes. DC Comics, which published under the names National and All-American at the time, received an overwhelming response to Superman and, in the years that