Answer Posted / rabi

Neutral- it is a point where the sum of the current meeting
at that point is zero. E.g. in three phase star connected
winding the neutral is the point where all winding is
meeting at a same point obviously at normal operating
condition.
Ground- ground and earth both are same term. it may be a
reference point for in an electrical circuit from which
other voltages are measured, or a common return path for
electric current, or a direct physical connection to the
Earth.
Earthing -it is nothing but the process of connecting all
the neutral points of the equipment and non-conductive
exposed part of the metal structure to earth.

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