Piezoelectric actuators are devices that convert electrical energy into mechanical movement using the piezoelectric effect. This effect occurs in certain materials, such as quartz or ceramics, which change shape when an electric voltage is applied. These actuators are known for their precision and fast response times, making them ideal for applications in robotics, medical devices, and optical systems. These actuators can produce small displacements with high force, allowing for fine control in various settings. They are often used in micro-positioning systems, where exact movements are crucial, and in ultrasonic transducers, which rely on rapid vibrations to generate sound waves.