What are the differences in the historical development and publishing history of DC and Marvel?

DC Comics was founded in 1934 as National Comics, focusing initially on superhero comics. Marvel Comics, founded in 1939 as Timely Comics, initially focused on pulp magazines and later shifted to superhero comics in the 1940s. DC had a stronger focus on continuity and interconnected storylines for much of its history. Marvel historically maintained more self-contained series, allowing for easier entry points for new readers. Both have undergone significant shifts in editorial direction and creative teams over time.