In classical electromagnetism, magnetization is the vector field that expresses the density of permanent or induced magnetic dipole moments in a magnetic material. Accordingly, physicists and engineers usually define magnetization as the quantity of magnetic moment per unit volume. It is represented by a pseudovector M. Magnetization can be compared to electric polarization, which is the measure of the corresponding response of a material to an electric field in electrostatics.

विद्युतचुम्बकत्व के सन्दर्भ में, किसी चुम्बकीय पदार्थ में मौजूद स्थायी चुम्बकीय द्विध्रुव आघूर्ण अथवा प्रेरित चुम्बकीय द्विध्रुव आघूर्ण को चुम्बकन (magnetisation) अथवा 'चुम्बकीय ध्रुवण' कहते हैं।