This riddle asks: what can you hear but never see or touch?
The answer is sound.
You can hear sound through your ears, but sound itself is not something you can see with your eyes or hold in your hands. It travels through vibrations, yet we experience it mainly as something we hear.
The riddle works because it asks you to think about something familiar that is clearly real but cannot be handled like a physical object.
Voices, music, footsteps, thunder, and laughter are all examples of sounds you can hear. You may see the source that creates them, but the sound itself is invisible and cannot be touched. That makes “sound” the natural answer to the clue.
