A clef is a symbol that tells you which notes on a sheet of music represent which music sounds. It helps you know how to read the notes and how to play them. There are different types of clefs: treble clef, bass clef, and sometimes other clefs. When you see a treble clef, you know that the higher music sounds are represented on the upper part of the sheet of music. When you see a bass clef, you know that the lower music sounds are represented on the lower part of the sheet of music. When you see both the treble and bass clefs together, it’s like a puzzle and they fit together to make a complete picture of the music. So, the clef is like a helpful sign that guides you to play the right notes on your instrument.