F♯ is a musical note that is one semitone higher than F and one semitone lower than G. It is commonly used in various musical scales and compositions, particularly in the key of G major and D major. In the context of a piano, F♯ is the black key immediately to the right of F. In music theory, F♯ can also be represented as a sharp note, indicating that the pitch is raised. This note plays a significant role in many genres, including classical, jazz, and pop music, contributing to the overall harmony and melody of a piece.