What is the difference between a workbook and a worksheet?

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. Each cell can contain a number, text or formula. A cell can also reference another cell in the same worksheet, the same workbook or a different workbook.

A work sheet is a pice of paper that you do or work on and a work book is a book has a lot of papers that you have to do and a lot of reading.