A spreadsheet is an arrangement of cells organized in columns and rows that is used to store and manipulate data. A workbook contains one or more spreadsheets. Microsoft Excel is the most common program used to create spreadsheets. Spreadsheets have rows, columns, and cells identified by letters and numbers. Formulas use mathematical operators and cell references to perform calculations within a spreadsheet. Functions are predefined formulas that perform common tasks like summing a range of cells. Common uses of spreadsheets include budgets, grades, financial statements, data analysis, inventory, and forecasts.