Detective Comics
Detective Comics is an American comic book series published by DC Comics. The first volume, published from 1937 to 2011 (and later continued in 2016), is best known for introducing the superhero Batman in "Detective Comics" #27 (cover dated May 1939).
Batman
The early, pulp-inflected portrayal of Batman started to soften in "Detective Comics" #38 (April 1940) with the introduction of Robin, Batman's junior counterpart. Robin was introduced, based on Finger's suggestion, because Batman needed a "Watson" with whom Batman could talk. Sales nearly doubled, despite Kane's preference for a solo Batman, and it sparked a proliferation of "kid sidekicks". The first issue of the solo spin-off series "Batman" was notable not only for introducing two of his most persistent enemies, the Joker and Catwoman, but for a story in which Batman shoots some monstrous giants to death. That story prompted editor Whitney Ellsworth to decree that the character could no longer kill or use a gun.