To a first approximation, the Earth's magnetic field resembles that of an enormous bar magnet. Several features of the Earth's field vary in a predictable way across the surface of the globe and might, in principle, be used in assessing geographic position. A second geomagnetic parameter that varies across the surface of the Earth is the strength or intensity of the field.

Inclination angle: The angle at which the magnetic field lines intersect the surface of the earth.
Texts and descriptions are fine and dandy, but to see planet Earth for what it is is another thing altogether. A bar magnet or a compass when hanged from their gravitational center, they come equilibrium at north-south pole direction of the earth.

The reason for this magnetic field  is not explained yet however, most of the scientists believe that, earth's magnetic field looks like magnetic field of a bar magnet.

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