The piano is a versatile musical instrument that produces sound by striking strings with hammers when keys are pressed. It typically has 88 keys, consisting of both white and black keys, which represent different musical notes. Pianos can be classified into two main types: grand pianos, known for their large size and rich sound, and upright pianos, which are more compact and suitable for smaller spaces. Pianos are widely used in various music genres, including classical, jazz, and pop. They serve as both solo instruments and accompaniment for singers and other musicians. Learning to play the piano can enhance musical skills and provide a foundation for understanding music theory.