Ceramic capacitors are a type of capacitor primarily used in electronic circuits to store electrical energy. They have a ceramic dielectric material as the insulating layer between their plates, which can be made from various materials such as metal or ceramic itself. This class of capacitors is known for its high capacitance values and relatively low cost compared to other types. Ceramic capacitors are used extensively in power supplies, filter circuits, and oscillator applications due to their stable electrical characteristics over a wide range of frequencies.