Explain why a capacitor in a circuit blocks the flow of direct current but allows the flow of alternating current

Explain why a capacitor in a circuit blocks the flow of direct current but allows the flow of alternating current.

When a capacitor is connected to a d.c. source the capacitor charges and when it is fully charged, current flow stops.

When it is connected to an a.c, it charges when the voltage is increasing and discharges when the voltage is decreasing. Since increase and decrease in voltage is continuous, there is continuous flow of current in the circuit. Hence a capacitor allows flow of a.c.

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