What is intent by the expression constructive interference, Physics

In optics what is intended by the expression "constructive interference."

Answer:

This is factual for any kind of waves. Any time you have coherent waves of the same kind and frequency from at least two different sources impingent upon one and the same point in space the waves will interfere. When they hinder constructively the result is a wave whose amplitude is greater than the amplitude of either of the contributors.

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