A capacitance or capacitor is a device used to store electric charges Q.
It is basically composed of 2 plates of metal separated from each other.
When a voltage is applied in between the negative charges will move from one side to the other side until an equilibrium is reached.
The capacitance C is a value used to measure how good a capacitor is to store charges.
The formula of the capacitance is C= Q/V is the Farad.
Here is a good video explaining all that nicely:
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