Why Do Electrical Appliances Need Copper-clad Grounding Rods?

Anyone who has studied physics knows that most of the electricity used in daily life is a single-phase 220-volt power supply. There are usually two wires in the home, one is the live wire and the other is the neutral wire. Although the neutral wire is not charged, without the neutral wire, the current cannot form a loop and cannot work; but since we have a neutral wire, why do we still need copper bonded steel rod when using electrical appliances such as refrigerators, electric fans, and washing machines?
Electricity is one of the great inventions of mankind. Now we cannot do without electricity in every aspect of our lives. But at the same time, electricity cannot be seen or touched. In case of electric shock, it is lucky if the current is small, but if the current is too large, it will endanger people's lives, and the "electric tiger" will eat people. People have added a third wire to electrical appliances - the protective ground wire, or ground wire for short. One end of the ground wire is connected to the outer shell of the appliance, and the other end is connected to the copper clad ground rods buried underground.