The violin is a bowed string instrument with four strings tuned in perfect fifths. It is the smallest and highest-pitched member of the violin family of string instruments, which also includes the viola and cello.
A violin is sometimes informally called a fiddle, regardless of the type of music played on it. The word "violin" comes to us through the Romance languages from the Middle Latin word vitula, meaning "stringed instrument";this word may also be the source of the Germanic "fiddle".
A person who plays the violin is called a violinist or fiddler, and a person who makes or repairs them is called a luthier, or simply a violin maker.
A violin is usually played using a bow consisting of a stick with a ribbon of horsehair strung between the tip and frog (or nut, or heel) at opposite ends. A typical violin bow may be 75 cm (29 inches) overall, and weigh about 60 g (2 oz). Viola bows may be about 5 mm (3/16") shorter and 10 g (1/3 oz) heavier.
The standard way of holding the violin is with the left side of the jaw resting on the chinrest of the violin, and supported by the left shoulder, often assisted by a shoulder rest. This practice varies in some cultures; for instance, Indian (Carnatic and Hindustani) violinists play seated on the floor and rest the scroll of the instrument on the side of their foot. The strings may be sounded by drawing the hair of the bow across them (arco) or by plucking them (pizzicato). The left hand regulates the sounding length of the string by stopping it against the fingerboard with the fingertips, producing different pitches.