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 what is the difference between electric discharge and earthing

Electric discharge:

The flow of electric current through a gas is generally termed as electric discharge. However, flow of current through a liquid or a solid resulting in neutralization of accumulated charge is also called electric discharge.

It happens when the charge accumulated is large enough to create an electric field that can ionize the medium and make current flow from high potential to low potential thus discharging the accumulated charge.

Earthing:

Earthing is the proper connection of exposed metal parts of an electrical circuit to the ground. It is accomplished by thick copper wires. Earthing protects the appliances and human beings in case of insulation fail or accidental short circuit. When the live wire touches the earth wire, large current flows through it and causes the fuse to blow off or circuit breaker to trip and thereby protecting the appliance as well as users.

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When the positive and negative charges accumulated in different clouds and the positive charges accumulated near the ground meet each other, lightning occurs. The process of lightning is also called as electric discharge. 

When we touch a charged object with our fingers, the charges transfer deep down the earth through our body. This is called as earthing. 

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In electricity supply systems, an earthing system defines the electrical potential of the conductors relative to the Earth 's conductive surface. The choice of earthing system can affect the safety and electromagnetic compatibility of the power supply, and regulations can vary considerably among countries. Most electrical systems connect one supply conductor to earth (ground). If a fault within an electrical device connects a "hot" (unearthed) supply conductor to an exposed conductive surface, anyone touching it while electrically connected to the earth (e.g., by standing on it, or touching an earthed sink) will complete a circuit back to the earthed supply conductor and receive an electric shock .

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The properties and effects of electric discharges are useful over a wide range of magnitudes. Tiny pulses of current are used to detect ionizing radiation in a Geiger–M�ller tube . A low steady current can be used to ilustrate the spectrum of gases in a Gas-filled tube . A neon lamp is an example of a gas-discharge lamp , useful both for illumination and as a voltage regulator . A flashtube generates a short pulse of intense light useful forphotography by sending a heavy current through a gas arc discharge. Corona discharges are used inphotocopiers

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