Formula
Alternatively referred to as a function, a formula is an expression telling the computer what mathematical operation to perform upon a specific value. When referring to computer software, formulas are most often used in spreadsheet programs such as Microsoft Excel. In the below picture, is an example of a Microsoft Excel formula =SUM(A$1:A$3), which adds the total of cells A1,A2, and A3.
Also see: Absolute cell reference, Formula bar, Lookup, Relative cell reference, Spreadsheet, Sum, Whatif