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In mathematics, a function is a relation between a set of inputs and a set of permissible outputs with the property that each input is related to exactly one output. An example is the function that relates each real number x to its square x2.
Quick Answer. In Microsoft Excel, a function is a type of formula that allows the user to perform mathematical, statistical and logical operations more easily. While it is possible to create a unique formula, Excel offers users a variety of preset formulas that they term functions. Continue Reading.