The subject of interference topic of interest within waves. Regarding interference, we learn that it may be constructive or destructive, and we learn how standing waves are produced by the interference of a wave form and its reflections within a bounded medium.
Please bear in mind that the treatment of interference at this stage in the learning program will not be the last. Within the topic of Wave Optics, interference will make a big reappearance.
The phenomena of constructive and destructive interference are crucial for understanding many of the phenomena of Wave Optics including double slit diffraction, thin layer interference, the air wedge, and the Michelson interferometer.