Microsoft Excel is a popular spreadsheet software used by millions to organize and analyze data.Brian van der Brug / Los Angeles Times via Getty ImagesMicrosoft Excel is a widely used spreadsheet software that has been around for decades.To learn Excel, start slowly, play around with the basics, and seek out online tutorials.Excel is part of the Microsoft 365 suite of productivity software, that you can buy on subscription.Excel, Microsoft's spreadsheet program with millions of diehard fans and millions of outspoken detractors, has been around since 1985.