Sound is generated due to vibrations in atoms/molecules in a medium and thus always require materialistic medium. The physical parameters like Temperature, Pressure etc., effects the sound velocity.
On the other hand Light doesn't require a materialistic medium. It transmits in space through field.
The concept of field is still a mysterious thing to explain meticulously.
Light is transmitted by 'photons' which are treated as zero mass entity. The speed of sound is negligible when compared to speed of light. This is one of the reasons that while thunderbolts, we see flashing light fast and then hear sound. This is a best example.
In fact light falls in different spectrums and light which gets generated at a point travels through the universe changing its presence int he spectrum.
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