A lift-elevator is a vertical transportation device used to move people or goods between different levels of a building. It consists of a cab, or car, that travels up and down on rails or ropes, propelled by an electric motor. Modern elevators are equipped with various safety features, such as emergency brakes, safety sensors, and backup power supplies, to ensure passenger safety in case of an emergency. Regular maintenance and testing of elevators are essential to ensure their safe operation and compliance with relevant safety standards and regulations.