Question

What is the function of an earth wire? Why is it necessary to earth metallic appliances?
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Answer 1

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$<b> The metallic body of electric appliances is connected to the earth by means of earth wire so that any leakage of electric current is transferred to the ground. This prevents any electric shock to the user. That is why earthing of the electrical appliances is necessary.$

Answer 2

The earth wire passes the extra electricity to the underground so, there is the less chance of short-circuiting  and as result the electrical appliances remain save.

Earth metallic appliances is needed because metal is good conductor  of electricity, where non-metal is a bad conductor or insulator of electricity.