Piezoelectric devices are tools that generate electrical energy when mechanical stress is applied to certain materials. This phenomenon occurs in specific crystals and ceramics, which can convert vibrations or pressure into electrical signals. Common applications include sensors, actuators, and energy harvesting systems. These devices are widely used in various industries, including automotive for pressure sensors and consumer electronics for microphones and speakers. The ability to convert mechanical energy into electrical energy makes piezoelectric devices valuable for creating efficient and compact systems in modern technology.