Microsoft Excel is a Windows and Macintosh application designed to create and edit spreadsheets. Includes many built in features that are incredibly useful, like formulas and charts. Microsoft Excel has become the industry standard for creating spreedsheets, and has it's own file extension, .xls or .xlsx depending on the edition, with .xlsx becoming the standard extension after Excel 2007. The latest edition released was Excel 2013, released along with the Microsoft Office 2013 suite.