When a material is magnetized what happens to its magnetic domains?

When a material is magnetized, its magnetic domains, which are small regions where the magnetic moments of atoms are aligned in the same direction, become aligned in a uniform direction. In an unmagnetized state, these domains point in random orientations, canceling each other out. However, when an external magnetic field is applied, many of these domains reorient to align with the field, resulting in an overall magnetic effect in the material. This alignment increases the material's overall magnetization.