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Magnetic fields are conceptually represented by "field lines". These lines indicate the direction and strength of the magnetic field. Hence, field lines are vectors, they have both magnitude (representing field strength) and direction (field direction).
When two magnetic fields are superimposed on one another. Depending on the direction of the field lines of each magnetic field, the resultant field could be enhanced or weakened.
For simple examples, two magetic fields in the same direction will produce a stronger resultant field. On the other hand, two magnetic fields in the opposite direction produces a weakened resultant field.