Film capacitors are used for energy storage. They feature two metal foils that act as electrodes, and an insulating film in between that serves as a dielectric. Their stable and reliable design makes film capacitors a popular choice for use in many electrical and electronic devices, from radios to computers. They shine with good frequency characteristics and stability, so they are often incorporated into audio equipment and power supplies. They offer advantages such as low self-inductance and low equivalent series resistance, which improves their performance in many electronic circuits.