Question

Can Someone Explain Capacitor ?

Answer 1

Capacitor has two conductors separated by an insulator, sometimes air. Voltage placed on the capacitor give it + charge on one surface and - charge on the other, and this is stored electrical energy, which can be discharged and used later.

Answer 2

A capacitor (originally known as a condenser) is a passive two-terminal electrical component used to store energy electrostatically in an electric field.
http://en.wikipedia.org/wiki/Capacitor