What does Vanilla mean in WoW Terms? Vanilla World of Warcraft Slang Definition

The MMORPG World of Warcraft is well-known for having a massive vocabulary of slang among its millions of online players. What does Vanilla mean in WoW terms? The term Vanilla when used by WoW players refers to the original World of Warcraft level 1-60 campaign, before The Burning Crusade expansion pack was released. They might also refer to it as old school. The Vanilla WoW term is used fairly commonly by players, most often among veterans of the original game.