Castanets are a pair of handheld percussion instruments traditionally made from wood or plastic. They consist of two shells that are clicked together to produce a sharp, rhythmic sound. Castanets are commonly used in various forms of music and dance, particularly in flamenco performances, where they enhance the rhythm and add a lively element to the performance. These instruments are played by holding one castanet in each hand and striking them together using the fingers. Castanets can vary in size and shape, affecting their sound and tone. They are often associated with Spanish culture and are popular in both folk and classical music settings.