A piezo buzzer is a compact electronic device that generates sound through the piezoelectric effect, where certain materials produce mechanical vibrations when subjected to an electric voltage. These vibrations create audible tones, making piezo buzzers useful for signaling, alarms, and notifications in various electronic circuits. In cybersecurity and physical security systems, piezo buzzers are often integrated into alarm systems to provide immediate audible alerts during unauthorized access attempts or breaches. Their low power consumption, small size, and reliability make them a popular choice for embedded systems and security hardware.