Fret buzz is a common issue that occurs when a guitar string vibrates against the frets, producing an unwanted buzzing sound. This typically happens when the strings are too low, the frets are uneven, or the neck of the guitar is not properly adjusted. Fret buzz can affect the overall sound quality and playability of the instrument. To fix fret buzz, musicians often need to adjust the guitar setup, which may include raising the string height, leveling the frets, or adjusting the truss rod that controls the neck's curvature. Regular maintenance can help prevent fret buzz and ensure a better playing experience.