An active buzzer is an electronic device that produces sound when powered. Unlike passive buzzers, which require an external audio signal, active buzzers generate sound on their own when voltage is applied. They are commonly used in alarms, timers, and various electronic projects. These buzzers typically operate on a specific voltage, often 5V or 12V, and can be easily integrated into circuits. They are popular in educational settings, such as in STEM projects, where students learn about electronics and sound production. Active buzzers are compact, affordable, and available in various sizes and tones.