The material through which sound passes to reach your eardrums is commonly referred to as a medium. In the case of typical everyday situations, such as when you hear sounds in the air, the medium is indeed the air itself. Sound is a mechanical wave that travels by causing the particles of the medium to vibrate, transmitting energy from the sound source to your ears.
However, sound can also travel through other materials, such as solids and liquids. For example, sound waves can travel through water, metal, glass, or any other material that can transmit vibrations. In these cases, the specific material through which sound passes would depend on the environment and the medium present.
It's worth noting that in outer space, where there is a vacuum and no air or other material to transmit sound waves, sound cannot propagate as it does on Earth.