Foam is essential in firefighting, especially for class B fires with flammable liquids like gasoline and oil. It forms a blanket that smothers flames, cutting off oxygen and preventing vapor release. Different foam agents, such as AFFF and FFFP, are tailored for specific fire scenarios. Firefighters need proper training in foam use for effective incident management. Foam also aids in environmental protection when used responsibly. Understanding foam's properties and limitations is crucial for improving fire service response.