In simplest terms, a *function* is a predefined formula. Many Excel functions are shorthand versions of frequently used formulas. For example, compare the formula =A1+A2+A3+A4+A5+A6+A7+A8+A9+A10 with the formula =SUM(A1:A10). The SUM function makes the formula a lot shorter, easier to read, and easier to create. Some Excel functions perform complex calculations. For example, using the PMT function, you can calculate the payment on a loan at a given interest rate and principal amount.

All functions consist of a function name followed by a set of *arguments* enclosed in parentheses. (In the preceding example, A1:A10 is the argument in the SUM function.) If you omit a closing parenthesis when you enter a function, Excel adds ...

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