Capacitor stores an electrical charge or energy on its plates. They are used to smooth varying DC supplies by acting as a reservoir of charge. They have wider applications in industrial RF induction heating process like dental, jewellery etc and also useful for radio transmitters, plasma and RF generators, medical RF areas as MRI, CAT scanners, RF surgery, and high power particle accelerators. Vacuum capacitors are used for generation and management of high power RF energy. Variable capacitors are ideal for radio tuning circuits. Plastic capacitors are high voltage filter capacitors having a better application in audio coupling, pulse formed networks, energy storage, power factor correction, low and high pass filters. High voltage RF capacitors are used for transmission and high technical applications in areas like military, civil and medical. There is a wide range of capacitors available according to their applications, like Vacuum capacitors, electrolytic, tantalum bead, variable capacitors, super capacitors etc.