The kind of waves that don't require a travel medium is called [[1]] waves.

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Detailed Solution

The kind of waves that don't require a travel medium is called electromagnetic waves.
The only thing that constitutes electromagnetic waves are electric and magnetic fields moving at the speed of light through empty space. Mechanical waves require a medium for transmission, whereas electromagnetic waves can travel through any medium. So while mechanical waves cannot travel in a vacuum, electromagnetic waves can. Also, mechanical waves need particles to produce vibrations; that's why they travel through a medium like water, air, or anything else.

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