I know some history of the character, he was sold to what is now DC Comics back in 1938.
Superman was sold to DC in 1938. He has been around a whil.e
I am not a big fan of Superman, but I do like Supergirl. Oh, yeah? There are actually a few different superheroes named Supergirl. I like watching the new Supergirl show that is on TV. Oh, is that Supergirl the original, named Kara Zor-El? Yes it is. And of course Superman is on the show too. Oh, that's cool! He's a DC Comics character, right? Yes, he is. The whole storyline of all the characters is very neat. That's good. Have you ever read the comic books he is in? No I haven't, but I should look into it. My son would probably enjoy it as well.
They sold Superman to Detective Comics, the future DC Comics, in 1938.