Violin: 

Violin is a string instrument which has four strings and is played with a bow. The strings are usually tuned to the notes G, D, A, and E. The modern violin is about 400 years old. By the time the modern orchestras started to form in the 17th century, the violin was nearly fully developed. It became the most important orchestral instrument; In fact, nearly half of the instruments in the orchestra is made up of violins.