Microsoft Excel file is also known as Workbook. Important Points In Microsoft Excel, a workbook is a collection of one or more spreadsheets, also called worksheets, in a single file. Below is an example of a spreadsheet called "Sheet1" in an Excel workbook file called "Book1. "Our example also has the "Sheet2" and "Sheet3" sheet tabs, which are also part of the same workbook. When someone opens Microsoft Excel (a spreadsheet program), he/she is opening a workbook. A workbook can contain one or more different worksheets that can be accessed through the tabs at the bottom of the worksheet. Additional InformationDocument: A document is a written, drawn, presented, or memorialized representation of thought, often the manifestation of non-fictional, as well as fictional, content. Database: A database is an organized collection of structured information, or data, typically stored electronically in a computer system. A slide is a single page of a presentation. In the digital age, a slide most commonly refers to a single page developed using a presentation program such as MS PowerPoint, Apple Keynote, Google Slides, Apache OpenOffice or LibreOffice.