Overall, crossovers between Marvel and DC Comics aren't that common. Both companies have their own distinct universes and storylines, and when they do crossover, it's a big deal and attracts a lot of attention from fans. But it doesn't happen frequently.
DC and Marvel have had some crossover events in comics. They usually happen as special limited series or one-shot issues to generate buzz and appeal to fans of both franchises.
Not likely anytime soon. These two comic universes have their own storylines and characters, and a crossover would involve a lot of complex negotiations and planning.
Occasionally, there are. These crossovers often generate a lot of buzz among comic fans. They offer unique storylines and interactions that you don't typically see in their individual universes.