An acoustic piano is a traditional musical instrument that produces sound through the striking of strings by hammers when keys are pressed. It typically has 88 keys, consisting of both white and black keys, which allow for a wide range of musical notes. The sound is amplified naturally through a wooden body, making it distinct from electronic pianos. Acoustic pianos come in two main types: grand pianos and upright pianos. Grand pianos have a horizontal design and are often used in concert settings, while upright pianos are more compact and suitable for home use. Both types require regular tuning and maintenance to ensure optimal sound quality.