It's about the thirties of the last century. Comic books then began to gain popularity. If Superman in the 'Action Comics' series, published by National Comics Publications (formerly DC Comics), wins readers' minds in a very short time, the publishers decide to bring some more new superhero comics to their readers.
With that in mind, painter Bob Kane drew a new character and named it 'Batman'. Then a friend and colleague, the writer, called Bill Finger and asked to show the character.