What is buzzer?

A buzzer is an electronic device that produces a buzzing or beeping sound. It typically consists of a coil of wire and a magnetic diaphragm, and is activated by an alternating current (AC) or direct current (DC) signal. Buzzers are commonly used as audio indicators in electronic circuits, alarm systems, and other devices where audible alerts are needed. They come in different shapes and sizes, and can produce a range of different sounds and tones depending on their design and application. Some common types of buzzers include piezoelectric buzzers, electromagnetic buzzers, and mechanical buzzers.