A full-size acoustic guitar is a type of guitar that is typically around 40-42 inches in length and is designed to be played by adults or older children. It is made up of a hollow body with a sound hole, a neck with frets, and six strings that are typically made of steel or nylon. It produces sound acoustically, which means that the sound is created through the vibration of the strings and the resonance of the hollow body. Full-size acoustic guitars are commonly used in various genres of music, including folk, country, rock, and pop.