What is a function? (video) | Functions | Khan Academy
https://www.khanacademy.org/math/algebra/x2f8bb11595b61c86:functions/x2f8bb11595b61c86:evaluating-functions/v/what-is-a-function
Web ResultBasically, the concept of functions gives us a way to name the whole process of evaluating a particular expression, so we can talk about it as a whole. We can compare different functions, discuss their properties, or actually operate on functions to make new functions. It also broadens the concept, because not all functions can be
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