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Constructive interference is when two waves meet in a way that their crests line up. This results in a wave of a higher amplitude. On the other hand, destructive interference is when the crest of one wave meets with the trough of the other. This results in a wave of lower amplitude.
In constructive interference, the crests and troughs of two waves line up, and their respective amplitudes are added, making the amplitude of the new wave bigger.
In destructive interference, the crests and troughs are opposite to one another, and their amplitudes cancel out, making the amplitude of the new wave smaller or nonexistent.
I hope the included image helps.
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