So what is the correct answer? Is light a wave or a particle? Albert Einstein's answer suggests that he believed that it was both, and that is the current accepted definition. Light is a wave and a particle.

Recently, scientists performed the double slit diffraction experiment that shows both diffraction and interference again. This time, they altered the light source so that it released one photon at a time. What did they find?

In the following video, each time a photon hits the detector it shows up as a tiny dot of light. The dot stays lit to that you can see the pattern that the light makes. If photons are simply particles, some will go through one slit and make a bright spot, and some will go through the other slit and make a second bright spot.

The photons themselves show diffraction and interference, light truly is a wave and a particle at the same time.