What kind of instrument is a harmonica?

A harmonica is a free reed wind instrument, typically played by using the mouth to draw air through holes along a mouthpiece, which causes reeds to vibrate and produce sound. It is often used in various Music Genres, including blues, folk, and rock. Harmonicas come in different types, such as diatonic, chromatic, and tremolo, each offering unique tonal qualities and playing techniques. Its compact size and portability make it a popular choice among musicians.