C-flat is a musical note that is one semitone lower than C and is enharmonically equivalent to B. In the context of music notation, it is represented by the symbol "♭" placed before the note. C-flat is often used in certain scales and keys, particularly in classical music, to maintain the correct interval relationships. In terms of its position on the piano, C-flat is played using the same key as B. It can appear in various musical contexts, including orchestral compositions and jazz arrangements, where it helps create specific harmonic effects or fits within a particular key signature.