An acoustic guitar is a stringed musical instrument that produces sound through the vibration of its strings. It typically has a hollow body, which amplifies the sound naturally without the need for electronic amplification. Acoustic guitars come in various shapes and sizes, with the most common types being dreadnought, concert, and parlor guitars. The instrument is usually made from wood, with the top often crafted from spruce or cedar for better sound quality. Acoustic guitars can have six or twelve strings, and they are played by strumming or plucking the strings with fingers or a pick. They are popular in many music genres, including folk, country, and rock.