Sound is a kind of energy. It is energy we can hear. Did you know that things can be damaged by sound?
Sound is made by vibrations. When an object vibrates, sound waves are made. The waves move through air. The sound waves move into your ears. Sound waves make your eardrums vibrate, too. Then you can hear the sound.
Very loud sounds can hurt your ears. Loud sounds can cause hearing loss. You can't hear as well after listening to very loud sounds.