We give an animated demonstration of constructive interference of wave pulses for interfering upright wave pulses and interfering inverted wave pulses. Next, we demonstrate destructive interference of waves using an animation of wave pulses colliding, where one wave pulse is upright and the other is inverted. To summarize the results on constructive and destructive interference, constructive interference means the resulting sum of the waves has a larger amplitude, and destructive interference means the sum has a smaller amplitude.

To wrap up the wave interference animations, we animate two wave trains colliding (extended waves). This creates alternating constructive and destructive interference and results in a standing wave. The animation of the standing wave looks "stationary" because the nodes stay in the same place. The nodes are the points where the amplitude is always zero. The points of maximum amplitude also stay in the same place: these are the antinodes of the standing wave.