Fiddle

Fiddle is another name for the bowed string musical instrument more often called a violin. It is also a colloquial term for the instrument used by players in all genres, including classical music. Fiddle playing, or fiddling, which could refer to various styles of music.

There are no real distinctions between violins and fiddles, though more primitively constructed and smaller violins are more likely to be considered fiddles. Fiddle is also a common term among musicians who play folk music on the violin. The fiddle is part of many traditional (folk) styles of music which are aural traditions, taught 'by ear' rather than via written music. It is less common for a classically trained violinist to play folk music, but today, many fiddlers have classical training.

https://en.wikipedia.org/wiki/Fiddle