Dota 2 is a free-to-play multiplayer on-line battle arena (MOBA) computer game developed and printed by Valve Corporation. the game was released for Microsoft Windows, OS X, and Linux in July 2013, following a Windows-only public beta testing phase that began in 2011, and is the stand-alone sequel to Defense of the people (DotA), a mod for Warcraft III: Reign of Chaos and its expansion pack, The Frozen Throne. Dota 2 is one of the foremost actively compete games on Steam, with maximum peaks of over a million coinciding players.