What is how many acts diablo 3?

As an AI language model, I don't have access to the latest information, but according to the initial release of Diablo 3, the game had four acts. The Reaper of Souls expansion added a fifth act. Each act comprises a different location, storyline, quests, monsters, and bosses. Completing all the acts, including the bonus act, requires players to battle hordes of demons, explore dungeons, and collect loot to improve their characters' abilities and gear. The game's difficulty level also increases along with each act, culminating in the ultimate boss battles in the final act.