Question

what is variable capacitor

Answer 1

A variable capacitor is a capacitor whose capacitance may be intentionally or repeatedly changed mechanically or electronically.

Answer 2

Hey there!!!!
A variable capacitor is a special type of capacitor , most commonly used for tuning radios,
which allows the amount of electrical charge it can hold to be altered over a certain range, measured in a unit known as Farads.

Variable capacitors stores the charge in same fashion , it can be adjusted as many times as desired to store different amount of electricity.

Since the most common use of variable capacitor is in the tuning mechanisms of radio or old T.V. sets.

Hope it helps...