#In the Excel environment, the file used to store and process worksheet data is called a workbook.
Workbooks are files used to store and process work data in the Excel environment. Excel documents are workbooks. It is a collection of one or more worksheets in the Excel workspace, and its extension is XLS. In Excel, the file used to store and process work data is called a workbook. Each workbook can have many different worksheets, and up to 255 worksheets can be created in the workbook.
When the workbook is saved, the file suffix is .XLS (before version 03) or .XLSX (version 07). The worksheet is sometimes called SHEET. The default name of the worksheet is sheet1, etc.
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