What is the function of an earth wire? Why is it necessary to earth metallic appliances?

(N/A) The function of an earth wire is to provide a low-resistance path for electric current to flow into the ground in case of any leakage or short circuit.
It is necessary to earth metallic appliances because if there is any leakage of current,the metallic body of the appliance becomes live.
If a person touches such an appliance,the current will pass through their body to the ground,causing a severe electric shock.
By connecting the metallic body to the earth wire,the leakage current is safely transferred to the ground,thereby protecting the user from electric shocks.