On Violins, there are these things called "F Holes" that is when you play a string the sound comes out of the F Holes
Either the player's fingers pluck the strings or he or she uses the violin's bow to rub on its strings, thus creating vibrations. The vibrations of the strings enter the violin's body through the...
The strings vibrate... like a guitar.
They vibrate your ear drums and your brain translates that into sound.
The stick drawn across the strings of violin to produce sound is called a bow.