A worksheet or sheet is a single page in a file created with an electronic spreadsheet program such as Microsoft Excel or Google Sheets. A workbook is the name given to an Excel file and contains one or more worksheets. When you open an electronic spreadsheet program, it loads a blank workbook file consisting of one or more blank worksheets for you to use.

Worksheets allow you to store, edit, and display data.

The primary storage unit for data in a worksheet is a rectangular cell arranged in a grid pattern in each worksheet. Individual cells containing data are identified and organized using the worksheet's vertical column letters and horizontal row numbers, which create a cell reference, such as A1, D15, or Z467.

Worksheet specifications for current versions of Excel include: