What ways to produce sound in string instruments?

Sound in string instruments is produced primarily by vibrating strings, which can be set into motion in several ways. The most common methods include plucking the strings (as in Guitars and harps), bowing them (as in violins and cellos), and striking them (as in pianos). The vibrations travel through the body of the instrument, amplifying the sound and creating a rich tone. The pitch is determined by the string's length, tension, and mass.