The computer games were the origin of the Warcraft universe, and continue to be its primary focus. Much has changed in the lore since Warcraft: Orcs & Humans, with each new release greatly expanding the world and revising some of the past lore.
Warcraft I introduced the basic conflict between the orcs and humans, as well as the characters of Medivh, Llane, Garona, and Lothar.
World of Warcraft has continued this trend by allowing the players to experience nigh all of the colossal world as no more than one of the many little players, as well as introducing a host of new creatures and characters, such as Garrosh Hellscream, son of Grom.
Hearthstone: Heroes of Warcraft is an online card game that draws on Warcraft lore for its background, but does not introduce much new lore.