Piezoelectricity is a property of certain materials that allows them to generate an electric charge in response to applied mechanical stress. Some common naturally occurring and man-made piezoelectric materials include quartz, Rochelle salt, gallium orthophosphate, lead zirconate titanate (PZT), and polymers like polyvinyl fluoride. Piezoelectric materials find applications in actuators, sensors, and energy harvesters. Perovskite structures like barium titanate and lead titanate exhibit strong piezoelectricity and are used in piezoelectric ceramics. Walking can effectively charge a mobile phone battery using piezoelectric elements and a voltage regulation