Airsoft is a combat sport consubstantial to Paintball in which participants eliminate opponents by hitting them with (6 mm or occasionally 8 mm) plastic BBs (small, spherical balls) launched from airsoft guns, that can be powered by CO2, Leafy Gas, spring, or electrically powered gearboxes actuating a piston. Participants customarily use varying types of weapons aforethought as replicas of real firearms, tactical gear, and accessories passed down by military and corps organizations. In North America and Europe, there is a growing engrossment in airsoft.

An "honor system" is employed whereby the players rely on each others' Airsoft Guns honesty to admit to being hit, because unlike paintball, the plastic pellets do not leave a surface X distinguishable at a distance.