A water gun is a toy designed to shoot jets of water through a nozzle, typically used for recreational “combat” or cooling off during warm weather. Most models operate on basic fluid mechanics, where a manual pump or trigger mechanism creates pressure within a reservoir, forcing the liquid out at high velocity. These range from small, handheld “squirt guns” that rely on simple finger-actuated pumps to large, high-capacity blasters that use pressurized air or motorized systems to achieve greater distance and volume.