Diablo II is a very popular real-time RPG for the PC. D2 was created by Blizzard and was released in March of 2000. It's been nearly 8 years since the release of the game, and it still ranks among the most popular online games.
Having left off where Diablo 1 ended, Diablo II takes you through 4 completely different acts in hopes of defeating the three primary evils known as Diablo, Mephisto, and Baal. In the original Diablo II, you can only defeat Mephisto (at the end of the third act) and Diablo (at the end of the fourth act), while you can defeat Baal if you buy the expansion pack called Diablo II: Lord of Destruction.