Light waves- The sun is the main source of light waves on earth and require no medium to get to us.
Sound Waves- These waves require a medium to get to us.
For example if you put a bell in a vacuum sealed, air tight case and hit it then you wouldn't be able to hear the bell but you could still see it. This is because light waves don't need a medium but sound waves do.
This sums up a short summary on waves thanks for reading.
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