A castanet is a percussion instrument commonly used in Spanish music and dance, particularly in flamenco. It consists of two wooden pieces that are clicked together to produce a sharp, rhythmic sound. Castanets are often played by dancers, who hold one in each hand, adding a dynamic element to their performance. Traditionally made from hardwood, castanets can also be crafted from plastic or other materials. They come in various sizes and shapes, allowing for different tonal qualities. The instrument is an essential part of Spanish culture and is often featured in folk dances and theatrical performances.