Magnetic permeability is a property of a material on how it responds to magnetic fields.
The higher the permeability, the better is it's response.
Consider two linear materials 1 and 2 with permeabilities
For a magnetic intensity
Thus, one can see that higher the permeability, the greater is the magnetic induction for a given external magnetising field
The ratio of the permeability of a medium to that of vacuum is called the relative permeability of the medium.