Dipole moment is the measure polarity of a polar covalent bond .
In language of physics it can be defined as the measure of strength of electric dipole. It is defined as the product magnitude of charge on the atoms and the distance between the two bonded atoms. Its common unit is debye and SI unit is coulomb metre.
The magnitude of dipole moment is equal to the product of either charge and the distance between the charges and its direction is from -q to +q.It is directed from the (-)ve charge to the (+)ve charge.In fact, it is the behavior of a dipole.