Dota 2 in the context of Defense of the Ancients

Multiplayer online battle arena (MOBA) is a subgenre of strategy video games in which two teams of players compete on a structured battlefield, each controlling a single character with distinctive abilities that grow stronger as the match progresses. The objective is to destroy the enemy team's main structure while defending one's own. In some MOBA games, the objective can be defeating every player on the enemy team. Matches emphasize team coordination, tactical choices, and real-time combat. Players are assisted by computer-controlled units that periodically spawn in groups and march along set paths toward their enemy's base, which is heavily guarded by defensive structures. Players can influence these units by eliminating enemy waves or supporting their own, affecting lane control and map pressure. This type of multiplayer online video games originated as a subgenre of real-time strategy (RTS); however, most of the traditional RTS elements, such as building construction and unit production, were removed in favor of a more focused player-versus-player experience. The genre blends elements of real-time strategy, role-playing, and action games, combining strategic depth with individual character progression and fast-paced combat.

The first widely accepted game in the genre was Aeon of Strife (AoS), a fan-made custom map released in 2002 for StarCraft, in which four players each control a single powerful unit and, aided by weak computer-controlled units, compete against a stronger computer. Defense of the Ancients (DotA) was created in 2003 by the Warcraft III modding community for Warcraft III: Reign of Chaos and its expansion, The Frozen Throne, with a map based on AoS. DotA was one of the first major titles to establish the core mechanics of the MOBA genre, serving as a direct inspiration for later titles, and the first MOBA for which sponsored tournaments were held. It was followed by two spiritual successors, League of Legends (2009) and Heroes of Newerth (2010), a standalone sequel, Dota 2 (2013), and other games in the genre, including Smite (2014) and Heroes of the Storm (2015).

Valve Corporation, also known as Valve Software, is an American video game developer, publisher, and digital distribution company headquartered in Bellevue, Washington. It is the developer of the software distribution platform Steam and the game franchises Half-Life, Counter-Strike, Portal, Day of Defeat, Team Fortress, Left 4 Dead and Dota.

Valve was founded in 1996 by the former Microsoft employees Gabe Newell and Mike Harrington. Their debut game, the first-person shooter (FPS) Half-Life (1998), was a critical and commercial success and had a lasting influence on the FPS genre. Harrington left in 2000. In 2003, Valve launched Steam, followed by Half-Life 2 (2004), the episodic sequels Half-Life 2: Episode One (2006) and Episode Two (2007), the puzzle games Portal (2007) and Portal 2 (2011) and the multiplayer games Team Fortress 2 (2007), Left 4 Dead (2008) and Dota 2 (2013).

In the video game industry, a battle pass or rewards track is a type of monetization approach that provides additional content for a game usually through a tiered system, rewarding the player with in-game items for playing the game and completing specific challenges. Inspired by the season pass ticketing system and originating with Dota 2 in 2013, the battle pass model gained more use as an alternative to subscription fees and loot boxes beginning in the late 2010s. Battle passes tend to offer free passes, which are available to all users, and premium passes that require annual or seasonal charges in exchange for enhanced items and cosmetics.

Battle passes may be given different terms depending on the game. For example, Rocket League and PlayerUnknown's Battlegrounds offer a "Rocket Pass" and "Survivor Pass" respectively.