A Capacitor is a device consisting of two conductors that can be charged with equal and opposite charges, separated by a thin insulator.
According to principle of a capacitor, capacitor is a system of conductors or dielectric.
If there is a single conductor, it cannot holds very much current then its potential reaches to its maximum values and it cannot hold more charge.
If we place another conductor near it, its potential becomes low and it is able to store more charge.
We know from the definition of the capacitor, A capacitor is a two-terminal electrical device that possesses the ability to store energy in the form of an electric charge. It consists of two electrical conductors that are separated by a distance. The space between the conductors may be filled by vacuum or with an insulating material known as a dielectric.
Capacitors store energy by holding apart pairs of opposite charges. The simplest design for a capacitor is a parallel plate capacitor.
Therefore, this device is called a capacitor.
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