A Single-Action Airbrush is a type of airbrush that operates with a simple mechanism. In this design, the user controls the airflow by pressing down on the trigger, while the paint flow remains constant. This makes it easier for beginners to use, as they only need to focus on adjusting the air pressure to achieve different effects. Single-action airbrushes are commonly used for various applications, including model painting, nail art, and fine art. They are ideal for tasks that require consistent paint application, such as creating backgrounds or larger areas of color.