What is wave interference? Wave interference is when two waves moving along the same medium are released within the same relative area and they begin to overlap. This overlapping creates noise. Think of it as if you threw two pebbles into a pond parallel to each other. Each pebble would create its own wave around it as it falls into the pond, however, in the area between where the two pebbles met the water, the waves from each pebble would have hit each other, either combining into one wave, or cancelling both waves completely. In light and sound, this describes the phenomenon of wave interference.