A spray gun is a tool used to apply paint, coatings, or other liquids in a fine mist. It works by using air pressure or a mechanical pump to atomize the liquid, allowing for an even and smooth application on surfaces. Spray guns are commonly used in various industries, including automotive, construction, and woodworking, as well as for DIY projects. There are different types of spray guns, such as airless spray guns and HVLP (High Volume Low Pressure) spray guns, each designed for specific applications. Proper use of a spray gun can lead to professional-looking finishes, making it a popular choice among painters and craftsmen.