Question

What is a “ medium” in regards to waves ?

Answer 1

In a similar manner, a wave medium is the substance that carries a wave (or disturbance) from one location to another. ... In the case of our slinky wave, the medium through that the wave travels is the slinky coils. In the case of a water wave in the ocean, the medium through which the wave travels is the ocean water.

Answer 2

A medium can be anything that a wave can pass through e.g the medium can be solid objects, air, water, etc.