The violin is a string instrument known for its beautiful, expressive sound. It has four strings tuned in perfect fifths and is played with a bow, which is drawn across the strings to produce music. The violin is a key instrument in many genres, including classical, folk, and jazz, making it versatile and popular among musicians. Playing the violin requires practice and skill, as it involves precise finger placement and bowing techniques. Famous composers like Johann Sebastian Bach and Antonio Vivaldi have written iconic pieces for the violin, showcasing its ability to convey deep emotions and intricate melodies.