"Superman is a fictional character, a comic book superhero appearing in publications by DC Comics, widely considered to be an American cultural icon. Created by American writer Jerry Siegel and Canadian-born American artist Joe Shuster in 1932 while both were living in Cleveland, Ohio, and sold to Detective Comics, Inc. (later DC Comics) in 1938, the character first appeared in Action Comics #1 (June 1938) and subsequently appeared in various radio serials, television programs, films, newspaper strips, and video games. With the success of his adventures, Superman helped to create the superhero genre and establish its primacy within the American comic book. The character's appearance is distinctive and iconic: a blue, red and yellow costume, complete with cape, with a stylized "S" shield on his chest. This shield is now typically used across media to symbolize the character."
Source: Wikipedia, "Superman", available under the CC-BY-SA License.