Hi, I'm new to the forums. I know next to nothing about anything related to physics. My question is about light. Light as a stream of particles (photons) kind of makes sense to my unscientific brain. But light as waves? Ocean waves are surface waves propogated across the surface of the water. Sound waves are pressure waves propogated through the air, or through whichever medium happens to be carrying the sound waves. How can light be waves? What is the medium of propogation? How can you have waves in the empty vacuum of space? What is it that's waving?