Warcraft III: Reign of Chaos (War3 or WC3 or RoC) is a real-time strategy computer game released by Blizzard Entertainment in July 2002. It is the second sequel to Warcraft: Orcs & Humans, and it is the third game set in the Warcraft Universe. An expansion pack, The Frozen Throne, was released in 2003.

Warcraft III contains four playable races:[1] Humans and Orcs, which had previously appeared in Warcraft: Orcs & Humans and Warcraft II: Tides of Darkness, and the Night Elves and Undead, which are new to the Warcraft mythos.[2] Warcraft III's single-player campaign is laid out similarly to that of StarCraft, being told through all four of the game's races in a progressive manner. Multiplayer mode allows for play against other people, via the internet, instead of playing against computer-controlled characters as is done in the single-player custom game mode.