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A power supply is an electrical device that provides the necessary energy for electronic systems, machines, and appliances to operate. It converts the incoming electrical power—such as AC from a wall outlet—into the specific voltage, current, and frequency required by the connected device.

Power supplies come in various types, including AC-DC converters, DC-DC converters, linear power supplies, and switching power supplies. They are essential components in computers, industrial equipment, consumer electronics, medical devices, and communication systems, ensuring stable, safe, and efficient power delivery for reliable operation.