Why does the violin belong to string category?

The violin belongs to the string category because it produces sound by the vibration of strings. These strings are stretched between two fixed points, the bridge and the tailpiece, and are made to vibrate by the action of a bow or by plucking. The vibrations of the strings cause the body of the violin to resonate, which results in the production of sound.

Other string instruments include the viola, cello, double bass, guitar, harp, and piano.