In summary, ferroelectricity and piezoelectricity are two closely related phenomena that involve the manipulation of electrical charges in certain materials. Ferroelectricity is the ability of a material to maintain a spontaneous polarization even after an external electric field is removed, while piezoelectricity is the generation of an electric charge in response to mechanical stress. These properties have important applications in various fields, such as sensors, actuators, and memory devices, making them essential areas of study in materials science and engineering. The discovery of the connection between ferroelectricity and piezoelectricity has opened up new possibilities for developing more efficient and versatile technologies.