Piezoelectric sensors are devices that generate an electrical charge in response to mechanical stress. They are made from materials that exhibit the piezoelectric effect, which means they can convert physical pressure, vibration, or strain into an electrical signal. This property makes them useful in various applications, such as measuring force, pressure, and acceleration. These sensors are commonly used in industries like automotive, aerospace, and healthcare. For example, they can be found in microphones, accelerometers, and ultrasound equipment. Their ability to provide real-time data makes them valuable for monitoring and controlling systems in various technological fields.