Final answer:
Stringed instruments produce sound by vibrating strings and are classified as chordophones.
Step-by-step explanation:
Stringed instruments are a type of musical instrument that produce sound by vibrating strings. Some examples of stringed instruments include the violin, guitar, harp, and piano. These instruments have a sounding box, such as the body of a violin or the wooden frame of a piano, which amplifies the sound created by the vibrating strings. Stringed instruments are classified as chordophones in the classification system used in ethnomusicology.