Magnetostriction is a phenomenon where a material changes its shape or dimensions when exposed to a magnetic field. This effect occurs in certain materials, particularly ferromagnetic ones, due to the alignment of magnetic domains within the material. When the magnetic field is applied, these domains align, causing the material to expand or contract. The degree of change in size or shape depends on the strength of the magnetic field and the specific properties of the material. Magnetostriction is utilized in various applications, including sensors, actuators, and transformers, where precise control of movement or dimensions is required.