This video shows us constructive interference. Constructive interference is when two crest or two trough waves hit each other causing the two waves to become bigger and combine for a second then go back into two separate waves.
This video shows us destructive interference. Destructive interference is when a crest wave and a trough wave hit each other causing the wave to cancel out and become still just for a second then separate into two waves.
This video shows us standing waves. Standing waves is when two interference waves have the same amplitude and wavelength, causing the wave pattern and creates point where they cross called nodes.