Piezoelectric materials are substances that generate an electric charge when mechanically stressed. This property arises from their unique crystal structures, which allow them to convert mechanical energy into electrical energy and vice versa. Common examples include quartz and certain ceramics, which are widely used in sensors, actuators, and transducers. These materials are essential in various applications, such as in microphones, speakers, and ultrasonic devices. When pressure is applied to a piezoelectric material, it produces a voltage, enabling the detection of sound waves or the generation of vibrations. Their ability to respond to mechanical changes makes them valuable in modern technology.