《Dota 2》是一款由Valve開發免費的多人線上戰鬥競技類(MOBA)遊戲。2011年Dota 2開始在Windows平台上進行測試，它的前身《DotA》是《魔獸爭霸III》及擴展版本寒冰霸權中的一張自訂遊戲地圖。玩家將分為兩隊，每隊各有五名隊員，地圖有上、中、下三條主要的作戰道路，中間以河流為界。玩家將以守護己方遠古遺蹟並摧毀敵方遠古遺蹟為遊戲目標，通過提升等級、賺取金錢、購買裝備和擊殺敵方英雄等手段來勝出遊戲。Dota 2的電競比賽發展蓬勃，世界各地均有不同規模的聯賽，其中最大規模的是「國際邀請賽」，為現今獎金最高的電競比賽，第十屆賽事冠軍獎金高達一千八萬美金。
Dota 2 is a multiplayer online battle arena (MOBA) video game developed and published by Valve on Windows in 2011. The game is a sequel to Defense of the Ancients (DotA), which was a community-created mod for Blizzard Entertainment’s Warcraft III: Reign of Chaos. Dota 2 is played in matches between two teams of five players. The map is divided into 3 main lanes: top, mid and bottom, with a crossable river between each lane. Players will have to protect their “Ancient” while trying their best to destroy the opponent’s “Ancient” by levelling up their heroes, obtaining gold, buying items and killing enemy heroes to win the game. Dota 2’s esports is massive, having tournaments of different scale all over the world, with “The Invitational” (TI) being the biggest among them. The champion of TI10 claimed over US$18 million, making TI the esports tournament with the biggest prize pool.