A capacitor is an electronic component that stores electrical energy in an electric field. It consists of two conductive plates separated by an insulating material called a dielectric. When voltage is applied, the capacitor charges up, allowing it to store energy for later use. Capacitors are commonly used in various electronic devices, including radios, computers, and power supplies. Capacitors come in different types and sizes, each suited for specific applications. For example, ceramic capacitors are often used in high-frequency circuits, while electrolytic capacitors are used for larger energy storage. Their ability to release energy quickly makes them essential in smoothing out voltage fluctuations and filtering signals in electronic systems.