Microsoft Excel is a spreadsheet program written and distributed by Microsoft. 

Excel was originally written for the Apple Macintosh in 1984-1985 and was one of the first spreadsheets to use a graphical interface with pull down menus and a point and click capability using a mouse-pointing device. It is overwhelmingly the dominant spreadsheet application available and has been since Version 5 (1993) and its bundling as part of Microsoft Office.