A smoke machine is a device that produces a thick vapor resembling smoke, often used in entertainment settings like theaters, concerts, and parties. It works by heating a special fluid, usually a mixture of water and glycol or glycerin, which creates a fog-like effect when vaporized. This effect enhances lighting and creates an atmospheric ambiance. Smoke machines are also utilized in various industries for testing ventilation systems, fire safety drills, and special effects in film production. They come in different sizes and types, including handheld units and larger machines for stage use, making them versatile tools for creating visual effects.