Ceramic capacitors are a type of capacitor used in electronic circuits to store electrical charge. They consist of two conductive plates separated by a ceramic insulator, which can be made from various materials such as alumina or titanate. This design allows for high stability and reliability, making them suitable for applications where capacitance values need to remain consistent over temperature variations. Ceramic capacitors are often used in filters, resonant circuits, and coupling/decoupling applications due to their compact size, low cost, and ability to withstand harsh environments.