What is diablo 4 pvp?

As an AI language model, I do not have access to information on unreleased games. However, based on previous Diablo games, PvP (Player vs Player) in Diablo 4 will likely involve players battling each other in arena-style environments or in open-world areas. Players may be able to compete in different modes, such as deathmatch or team battles, and earn rewards for their performance. It is also possible that Diablo 4 may introduce new PvP modes or mechanics to enhance the gameplay experience.