Question

What is earthing? What is the colour of the wire used for and why is it necessary to earth metallic to earth electric appliances

Answer 1

Earthing also known as grounding . this is done by connecting to earth's electric energy for physical well being . the colour of earth wire is green or striped with yellow . it is necessary for the safety . you can say for neutralising the charge and so that there could be no shot circuit in the near future.
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Answer 2

Answer:

Earthing is the process of transferring the immediate discharge of electricity directly to the earth plate, by means of low resistance electrical cables or wires. ... Safety to persons operating high power electrical systems is ensured by earthing