A real-time strategy (RTS) video game is a strategic game that is distinctly not turn-based. The phrase real-time is used to distinguish such games within the broader genre of strategic wargames, which has a longer history both inside and outside of video gaming. Some important concepts related to real-time strategy include tactical combat and twitch-based action. Other RTS gameplay mechanics implied are resource gathering, base building and technological development, as well as abstract unit control (giving orders as opposed to controlling units directly). Generally, the player is given a top-down perspective of the battlefield, though some 3D RTS games allow total freedom of camera movement. Additionally, the in-game user interface is much like a computer desktop: the player can manipulate controls and in-game units with techniques such as clicking and dragging. Each player in an RTS may interact with the game independently of other players, so that no player has to wait for someone else to finish a turn. This lends the genre well to multiplayer gaming, especially in online play, compared to turn-based games.



http://en.wikipedia.org/wiki/Real_time_strategy