Ceramic capacitors are a type of capacitor used in electronic circuits to store electrical energy. They have a ceramic dielectric material as the insulating layer between their metal plates, which provides high capacitance values while maintaining compact sizes and relatively low costs. The key characteristics of ceramic capacitors include: High capacitance-to-size ratio Low ESR (Equivalent Series Resistance) for minimal power loss Wide operating temperature range (-55°C to 125°C) Good insulation resistance These features make them suitable for various applications, such as filtering, coupling, bypassing, and decoupling in electronic circuits.