The musical instrument that has 88 keys is the piano. This versatile instrument includes 52 white keys and 36 black keys, allowing musicians to play a wide range of notes across several octaves. Pianos are used in various musical genres, from classical to jazz to contemporary music. The design and functionality of the piano have evolved over centuries, and it remains a popular choice for both beginners and professional musicians alike. The keyboard layout enables players to create complex harmonies and melodies, making the piano a staple in music education and performance.