Clawhammer banjo is a traditional style of playing the banjo that involves striking the strings with the fingernails in a downward motion, creating a distinct sound that is integral to old-time music. This technique is characterized by its rhythmic and syncopated patterns, which contribute to the lively feel of the genre. The clawhammer style is often associated with folk traditions and has deep roots in Appalachian culture, making it a key element of old-time music.