A percussion instrument is a type of musical instrument that produces sound when struck, shaken, or scraped. Common examples include drums, tambourines, and maracas. These instruments can be made from various materials, such as wood, metal, or plastic, and are often used in many musical genres, including classical, jazz, and rock. Percussion instruments are typically classified into two categories: tuned and untuned. Tuned percussion instruments, like xylophones and marimbas, produce specific pitches, while untuned instruments, such as cymbals and snare drums, do not have a definite pitch. Together, they add rhythm and texture to musical compositions.