What are the differences between Workbooks & Worksheets & spreadsheets?

workbooks = excel file for example ( book1.xlsx )

worksheet  = are unlimited number of sheets inside the workbook (sheet1) sheet2....etc

spreadsheets = are worksheets or some tables inside it, but some people name the whole program as the spreadsheet.

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An Excel worksheet is a single spreadsheet that contains cells organized by rows and columns. A worksheet begins with row number one and column A

A workbook is an Excel file that contains one or more worksheets

workbooks refer as the excel file as a whole, worksheet is part of a workbook and spread sheet is single sheet in an MS Excel File.