What is earthing or grounding in household electrical circuits?

(N/A) When we bring a charged body in contact with the earth,all the excess charge on the body disappears by causing a momentary current to pass to the ground through the connecting conductor. This process of sharing the charges with the earth is called grounding or earthing.
$A$ thick metal plate is buried deep into the earth and thick wires are drawn from this plate; these are used in buildings for the purpose of earthing near the mains supply.
The electric wiring in our houses has three wires: $live$,$neutral$,and $earth$.
The first two carry electric current from the power station and the third is earthed by connecting it to the buried metal plate.
Metallic bodies of electric appliances such as electric iron,refrigerator,and $TV$ are connected to the earth wire. When any fault occurs or a live wire touches the metallic body,the charge flows to the earth without damaging the appliance and without causing any injury to humans.
Earthing provides a safety measure for the human body,electrical circuits,and appliances.