The Formula tab
The Formula Library: This is a quick reference to all of the different mathematical functions and operations that can be calculated using Excel.
The Defined Names group: This feature, used in conjunction with the database and filtering features of Excel, creates cell names for use in database filtering.
The Formula Auditing group: This section features options to evaluate and edit complex formulas so that users may locate errors within formulas.
The Calculation group: This function determines when formulas are calculated, either automatically (by default) or manually.