Electrostriction is a property of certain materials that change shape or size when an electric field is applied. This effect occurs in all dielectric materials, but it is most pronounced in specific materials like polymer films and ceramics. The deformation is typically small and proportional to the square of the electric field strength. This phenomenon is different from piezoelectricity, where materials generate an electric charge in response to mechanical stress. Electrostrictive materials can be used in various applications, including sensors, actuators, and energy harvesting devices, due to their ability to convert electrical energy into mechanical movement.