Functions play an integral role in Excel.
You should already know about formulas and how they are used within the Excel environment. In other words, functions are just formulas that have already been created for you. Most functions are pretty involved and will probably require you to use the Paste Function interface to help you properly enter the necessary arguments, at least initially. Each function utilizes a specific structure called its syntax. The typical syntax involves the function name, the required arguments, and any optional arguments.