They are a rubber band for you to store energy. Give it a Voltage (Electromotive FORCE) and it pushes back. That’s the energy you’ve stored. Give it a way to release it (by connecting it to a circuit) and you could release the energy stored.
How far the rubber band moves away from the center is the charge stored, and capacitance (Charge per Volt) tells you how elastic the rubber band is, and how much energy it could store.
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