The musical instrument that uses a bow to produce sound is the violin. The violin is a string instrument typically made of wood and features four strings tuned in perfect fifths. Sound is produced by drawing a bow made of horsehair across the strings, causing them to vibrate. The pitch can be altered by pressing the strings against the fingerboard with the left hand, allowing for a wide range of musical expression. The violin is an essential instrument in classical music, as well as in folk, jazz, and various other genres. Its versatility and rich tone make it a favorite among musicians worldwide.