This document discusses formulas and functions in Excel. It defines a formula as an equation that performs operations on worksheet data using cell references. It explains that formulas begin with an equal sign and are calculated from left to right based on order of operations. The document also defines functions as predefined formulas that perform calculations using specific arguments in a defined order or structure. It provides examples of logical functions like AND, OR, and IF and explains how to use cell references in formulas to refer to other cells or worksheets.