A single-action airbrush is a type of airbrush that operates with a simple mechanism. In this design, the user controls the paint flow by pressing down on the trigger, while the air is continuously released. This makes it easy to use, especially for beginners, as it requires less coordination than other types. Single-action airbrushes are commonly used for various applications, including model painting, nail art, and fine art. They are ideal for creating broad strokes and filling in larger areas, making them a popular choice for artists and hobbyists alike.