A capacitor is a two-terminal electronic component that stores electrical energy in an electric field. It consists of two conductive plates separated by an insulating material called a dielectric. Capacitors are widely used in electronic circuits for various purposes, including filtering, timing, and energy storage. When a voltage is applied across the plates, an electric charge accumulates, allowing the capacitor to store energy. This stored energy can be released when needed, making capacitors essential in applications like power supply smoothing and signal coupling. Their ability to charge and discharge quickly makes them invaluable in modern electronics.