Foam agents are substances that help create and stabilize foam, which is a collection of gas bubbles trapped in a liquid. They are commonly used in various industries, including firefighting, food production, and cosmetics. In firefighting, foam agents can smother flames and prevent re-ignition by forming a barrier between the fuel and oxygen. These agents work by reducing the surface tension of the liquid, allowing it to spread and form bubbles more easily. Common types of foam agents include surfactants, which are compounds that lower surface tension, and protein-based foams, which are derived from natural sources.