The violin is the best known bowed string instrument. It is the smallest of the string instruments normally used in orchestral music. It is used in all music styles and is very common in classical, country, and certain types of folk and traditional music. Another name for the violin is the fiddle.

The violin is a bowed string instrument. It usually has 4 strings and is an important instrument in both classical music and traditional music in different cultures around the world.

The violin is also one of the fundamental instruments of classical music. A typical symphonic orchestra has between 20 and 30 violin players usually split into two groups (Violin I and Violin II). In folk music, the violin is more often known as a fiddle, a term that is also used within classical music.

The violin is tuned in 5ths, G > D > A > E, being G the lowest. Other tunings can also be used.

For more detailed information, you can refer to this Wikipedia article