The violin is unique because it is a very versatile instrument. It can be used for a wide range of dynamic expression. The violin sounds closet to human voice. The violin is a little wooden box but it can make extremely complex loud sounds that are enough to fill concert halls that seat thousands of people.
Because of its high level of dynamic range, the violin has much solo repertoire compared to other classical or orchestra instruments.
Another unique fact about violin is that the main body of the modern violin contains about 70 different parts which are made from a variety of wood.
What is unique about the violin is that the bow is made of horse hair, which comes from the horse's tail. Traditionally, bow hair comes from the tail of a grey male horse, (which has predominately white hair.) Solid resin is rubbed onto the hair, to make it sticky.
The violin originated from a medieval instrument called the rebec, which was commonly used in Europe for about seven hundred years. It had a pear-shaped body, and it was played in the same way as a violin. The rebec was introduced to Europe from the Muslim world by the moors in Spain. The violin is also very expressive and emotional. It sounds very similar to the human voice.