The piano is widely used in western music for solo performance, chamber music, and accompaniment. If you missed piano lessons in school, you can try to learn piano online.
According to wikipedia,
The word piano is a shortened form of the word pianoforte, which is seldom used except in formal language and derived from the original Italian name for the instrument, gravicÃ¨mbalo col piano e forte (literally harpsichord with soft and loud).
Learning to play the piano is one of the bases for mastering most musical instruments. The piano is a very good primer on identifying, understanding, and playing different notes.