Fog machines are devices that create artificial fog or smoke, often used in entertainment settings like theaters, concerts, and Halloween events. They work by heating a special fluid, usually a mixture of water and glycol or glycerin, which produces a thick vapor when released into the air. This vapor condenses into tiny droplets, creating the fog effect. These machines come in various sizes and types, including handheld models for small events and larger units for stage productions. Fog machines enhance visual effects, making lighting more dramatic and creating an immersive atmosphere for audiences. They are also used in photography and film to add depth to scenes.