The violin is a string instrument that typically has four strings tuned in perfect fifths. It is played with a bow, which is drawn across the strings to produce sound. The body of the violin is hollow, allowing it to amplify the sound created by the vibrating strings. Violins are commonly used in various music genres, including classical, folk, and jazz. They are an essential part of orchestras and ensembles, often leading melodies. Famous composers like Johann Sebastian Bach and Wolfgang Amadeus Mozart have written significant works featuring the violin.