Which category of instruments produces sound when they are struck or their body vibrates?

Instruments that produce sound by being struck or through the vibration of their own body are classified as idiophones. This category includes instruments like cymbals, marimbas, and bells. The defining feature of idiophones is that the body of the instrument itself vibrates to create sound, without the need for strings, air columns, or electronic amplification.

Other categories such as chordophones depend on vibrating strings; aerophones produce sound through vibrating air (like flutes and trumpets), and electrophones rely on electronic means to generate sound. These distinctions clarify why idiophones are specifically recognized for their unique ability to create sound through direct vibration or impact, setting them apart from the other categories.