* Mechanical waves require a medium: Mechanical waves need a physical medium (like air, water, or a solid) to travel. They are disturbances that propagate through the medium by causing particles to vibrate.
* Radio waves are electromagnetic waves: Radio waves belong to the electromagnetic spectrum, which means they are made up of oscillating electric and magnetic fields. They can travel through a vacuum (like space) where there is no medium.
In summary: Radio waves are a type of electromagnetic wave, while mechanical waves require a physical medium to propagate.
