Warcraft III 's single-player campaign is laid out similarly to that of StarCraft, and is told through the races in a progressive manner. Four playable factions can be chosen from: Humans, Orcs, (both of which appeared in the previous games) and two new factions: the Night Elves and the Undead. In the game, as in many real-time strategy (RTS) games, players collect resources, train individual units and heroes, and build bases in order to achieve various goals (in single-player mode), or to defeat the enemy player. It chronicles the combined efforts of the Human Alliance, Orcish Horde, and Night Elves to stop them before they can corrupt the World Tree. Warcraft III is set several years after the events of Warcraft II, and tells the story of the Burning Legion's attempt to conquer the fictional world of Azeroth with the help of an army of the Undead, led by fallen paladin Arthas Menethil.

An expansion pack, The Frozen Throne, was released in July 2003. It is the second sequel to Warcraft: Orcs & Humans, after Warcraft II: Tides of Darkness, the third game set in the Warcraft fictional universe, and the first to be rendered in three dimensions. Warcraft III: Reign of Chaos is a high fantasy real-time strategy computer video game developed and published by Blizzard Entertainment released in July 2002.

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