A spreadsheet is a sheet of paper or digital file that's divided into rows and columns that allows you to store and analyze data in an organized format. Paper spreadsheets allow you to physically enter data into the rows and columns, but you have to manage your own calculations. Computer spreadsheets can take care of the calculations for you, but you have to enter the formulas into the spreadsheet. Popular computer and web-based spreadsheet applications include Microsoft Excel, Apple Numbers, and Google Sheets.