Artillery is the generic name for either early two- or three-player (usually turn-based) computer games involving tanks fighting each other in combat or similar derivative games. Artillery games are among the earliest computer games developed; the theme of such games is an extension of the original uses of computer themselves, which were once used to calculate the trajectories of rockets and other related military-based calculations. Artillery games have been typically described as a type of turn-based strategy game, though they have also been described as a type of "shooting game."