# What is the difference between sound and vibration?

As far as I know, the only difference between sound and vibration is that sound propagates but vibration does not. In most cases, they are the same. Please help clarify these concepts.

• Your brain interprets a vibration of the ear drum which is between approximately $20\, \ rm Hz$ and $20\,\rm kHz$ as a sound. – Farcher Jul 17 '18 at 7:30
• How is it that vibration does not propagate? Can you be more specific with examples? Sound is in fact vibration. – ggcg Jul 18 '18 at 18:00