Diffraction:Diffraction is the bending or spreading out of waves as they pass through an opening or around obstacles. It can also contribute to the formation of interference patterns.
Constructive Interference: Constructive interference occurs when two waves combine to create a larger amplitude, resulting in a region of increased intensity in an interference pattern.
Destructive Interference: Destructive interference happens when two waves combine to cancel each other out, resulting in a region of decreased intensity in an interference pattern.