A speaker is an electroacoustic device that converts electrical audio signals into sound waves that can be heard by the human ear. It works by using a driver—typically made up of a diaphragm, voice coil, and magnet—that vibrates in response to the input signal, producing variations in air pressure which we perceive as sound. Speakers come in various types and sizes, ranging from compact portable units used with smartphones to large, high-fidelity systems designed for home theaters, studios, or live events. They are essential components in audio systems such as televisions, computers, mobile devices, and public address systems, delivering clear and amplified sound for music, speech, and other audio content.