The instrument that has 88 keys is the piano. This versatile keyboard instrument comes in various types, including grand, upright, and digital pianos. The keys are divided into 52 white keys and 36 black keys, each representing different musical notes. Due to its rich tones and wide dynamic range, the piano is a staple in many musical genres, from classical to pop. It allows for both melody and harmony, making it a popular choice for solo performances and accompaniment. Pianists can express a wide array of emotions through its keys, and it plays a vital role in music education.