A Capacitor is a passive two-terminal electrical component that implements electrical capacitance as a circuit element. A very basic Non-Ohmic component which is generally included virtually in every working circuit, in one or other form! Used to block DC component, store energy and build RC/RLC filters.

The electrolytic capacitors are polarized capacitors whose anode electrode (+) are made of a special metal on which an insulating oxide layer originates by iodization, which acts as the dielectric of the electrolytic capacitor.