Caption: Interference of 2 1-dimensional transverse waves (i.e., transverse waveforms or wave states or fields) at the same place in space.
Features:
Actually, nonlinear interference and diffraction occur too and are common for strong waves. However, for electromagnetic radiation (EMR), the superposition principle applies in almost all usual systems.
Waveforms of the same shape and size out of phase give exact cancellation: complete destructive interference as illustrated in the right panel of the image.