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Wave interference occurs when two waves meet across the same medium

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This shows as the wave travel towards each other in a medium

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As the waves meet in the medium, the medium changes shape as a result of the net effect of the waves colliding.

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Constructive interference occurs anywhere along the medium where two interfering waves have the same upward displacement. The waves are observed where the two waves are upwardly displaced.

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Occurs along the medium where interfering waves have an opposite displacement. The waves have the same maximum displacement but are travelling in opposite directions. There is no resulting displacement of the particles in the medium. The upward pulse of one of the waves is canceled out by the downward pull of the other.

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They do not need to have equal amplitudes for destructive interference to occur. Since they have differing displacements there is no total cancellation.

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When music is played in an auditorium, the sound waves bounce of the walls. As the waves interfere constructively, the acoustics in the auditorium become exceptional. If the waves interfere destructively, then the sound will not be heard clearly.

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An automobile muffler is another example. The exhaust system in a car makes a lot of noise, and without a car muffler, the noise would be very disruptive. The muffler produces a sound wave out that collides with the waves of the exhaust system, cancelling out the noise.

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"Interference of Waves." The Physics Classroom, www.physicsclassroom.com/class/waves/Lesson-3/Interference-of-Waves.

"Real-life Applications - Interference - Mechanical Waves, Sound Waves." Science Clarified, www.scienceclarified.com/everyday/Real-Life-Physics-Vol-2/Interference-Real-life-applications.html.