The induction cooktop uses electromagnetic energy to heat the cookware, rather than heating the stove surface directly. It typically consists of a smooth, flat surface with one or more induction elements built into it. The heating elements generate a magnetic field that induces an electric current in the metal of the cookware, which generates heat. Only ferromagnetic cookware such as cast iron or stainless steel with a magnetic base will work on an induction cooktop. Induction cooktops are considered to be more energy efficient than electric or gas cooktops because the heat is generated directly in the cookware and the cooktop surface stays cool to the touch, which makes them safer and easier to clean. They also tend to be more responsive to temperature changes, which can make them more precise for cooking. They are available in different sizes with multiple cooking zones