Piezoelectric devices are tools that generate an electric charge when mechanical stress is applied to certain materials. This phenomenon occurs in specific crystals and ceramics, which can convert mechanical energy into electrical energy and vice versa. Common applications include sensors, actuators, and energy harvesting devices, making them valuable in various industries. These devices work by utilizing the properties of piezoelectric materials, such as quartz and certain polymers. When these materials are compressed, stretched, or twisted, they produce a voltage. Conversely, applying an electric field can cause them to change shape, enabling their use in technologies like ultrasonic transducers and vibration sensors.