A wargame is a strategy game in which two or more players command opposing armed forces in a simulation of an armed conflict. Wargaming may be played for recreation, to train military officers in the art of strategic thinking, or to study the nature of potential conflicts. Many wargames re-create specific historic battles, and can cover either whole wars, or any campaigns, battles, or lower-level engagements within them. Many simulate land combat, but there are wargames for naval and air combat, as well.
A recreational wargame (Here I Stand) in play at CSW Expo 2009
Bolt Action, a miniature wargame set during World War 2
A game of Julius Caesar from Columbia Games shows how a player may only know the strength and unit type of their own forces, creating a fog of war element that does not exist in most tabletop wargames.
The US Navy Electronic Warfare Simulator (1958)
A strategy game or strategic game is a game in which the players' uncoerced, and often autonomous, decision-making skills have a high significance in determining the outcome. Almost all strategy games require internal decision tree-style thinking, and typically very high situational awareness.
Chess is one of the most well-known and frequently played strategy games.
Strategy game
A German military wargame from 1824