Superposition is the resulting displacement of a medium at any location, its the algebraic sum of the displacements where they meet. When two waves interfere with each other, they either combine and build up or they cancel each other out.
When they build up, it is known as constructive interference. This will only happen when two waves are traveling on the same side. The result of this would be the sum of the two waves combined.
Destructive interference is when the waves are traveling on opposing sides and they can result in total cancelation and having no wave at all.
Waves pass through each other as opposed to bouncing off of each other. This allows the constructive or destructive interference to occur.
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