violin, by name fiddle, bowed stringed musical instrument that evolved during the Renaissance from earlier bowed instruments: the medieval fiddle; its 16th-century Italian offshoot, the lira da braccio; and the rebec. The violin is probably the best known and most widely distributed musical instrument in the world.
Like its predecessors but unlike its cousin the viol, the violin has a fretless fingerboard. Its strings are hitched to tuning pegs and to a tailpiece passing over a bridge held in place by the pressure of the strings. The bridge transmits the strings’ vibrations to the violin belly, or soundboard, which is made of pine and amplifies the sound. Inside the instrument, beneath the treble foot of the bridge and wedged between the violin belly and back, which is made of maple, is the sound post, a thin stick of pine that transmits the string vibrations to the instrument’s back, contributing to the characteristic violin tone. The belly is supported from beneath by the bass bar, a narrow wood bar running lengthwise and tapering into the belly. It also contributes to the resonance of the instrument. The sidewalls, or ribs, are constructed of pine-lined maple.