Question

can electromagnetic waves travel through a medium? no, it is not possible for them to travel through a medium yes, but they travel slower through mediums such as air and water

Explanation:

Electromagnetic waves can travel through a vacuum (like space) and also through media such as air and water. When they travel through a medium, they interact with the particles of that medium. This interaction causes a delay in their propagation, so they travel slower in a medium compared to in a vacuum. For example, light (which is an electromagnetic wave) travels slower in water than in a vacuum.

Answer:

yes, but they travel SLOWER through mediums such as air and water