Excel Workbook is like a book that contains a number of pages while Excel Worksheet is a single page or sheet of a workbook like a page in a book.*.Linking two worksheets is more easy than linking two workbooks. The external workbook or data that is linked to main workbook needs to besecure and in case of removal its link from main workbook will be removed automatically.*.Workbook is not a place where we manipulate with data. It is worksheet or spreadsheet where we edit, write and save data. Workbook is just the face or cover of worksheets.