Microsoft Excel is important because it is the basic spreadsheet program used in Windows, which means a large number of computers in the world use it. Microsoft Excel focuses on making it easy for users to add in numbers to a spreadsheet. It is then a simple matter for the user to specify formulas in the spreadsheet that interact with these numbers in various ways.
For example, a user might specify for Excel to add up all the numbers in a column of the program. That way, it’s possible for the user and anyone the user sends the spreadsheet to see not only what the totals for the file are, but exactly where the totals came from. This is because it’s easy to go back in later and figure out where mistakes are made if they were. It’s also easy to change different fields in the program that correspond to different aspects of the operation.