A board wargame is a wargame with a set playing surface or board, as opposed to being played on a computer or in a more free-form playing area as in miniatures games. The modern, commercial wargaming hobby (as distinct from military exercises, or war games) developed in 1954 following the publication and commercial success of Tactics. The board wargaming hobby continues to enjoy a sizeable following, with a number of game publishers and gaming conventions dedicated to the hobby both in the English-speaking world and further afield.
In the United States, commercial board wargames (often shortened to "wargames" for brevity) were popularized in the early 1970s. Elsewhere, notably Great Britain where miniatures had evolved its own commercial hobby, a smaller following developed. The genre is still known for a number of common game-play conventions (or game mechanics) that were developed early on.
The early history of board wargaming was dominated by The Avalon Hill Game Company, while other companies such as SPI also gained importance in the history of the genre.
Wargames exist in a range of game complexities. Some are fundamentally simple (often called "beer-and-pretzel games") whereas others attempt to simulate a high level of historical realism ("consim"—short for 'conflict simulation'). These two trends are also at the heart of long-running debates about "realism vs. playability". Because of the subject matter, games considered 'simple' by wargamers can be considered 'complex' to non-wargamers, especially if they have never run into some of the concepts that most wargames share, and often assume some familiarity with.
Wargames tend to be representational, with many using soldier-shaped pieces on a map-like board; as such, they may colloquially be called "dudes on a map" games.
While there is no direct correlation, the more serious wargames tend towards more complex rules with possibilities for more calculation and computation of odds, more exceptions (generally to reproduce unique historical circumstances), more available courses of action, and more detail or "chrome".