What is «convolution» in mathematics?

Convolution is a mathematical operation on two functions to produce a third function that expresses how the shape of one is modified by the other.

en.wikipedia.org/wiki/Convolution

A convolution is an integral that expresses the amount of overlap of one function as it is shifted over another function.
It therefore "blends" one function with another.

mathworld.wolfram.com/Convolution.html

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towardsdatascience.com/convolution-a-journey-through-a-familiar-operators-deeper-roots-2e3311f23379#e1a0

See also: