Spreadsheet
In the new computer programs that work with tables, we put many tables together to make a big book called a workbook. This workbook is like a special computer file that holds all the information for the book, including the tables and the little boxes in the tables. Each table inside the workbook is called a worksheet or sheet for short. You can imagine these sheets like pages in a book. To switch between them, you can use tabs, just like flipping pages. But one program called Numbers does it differently. If you have many sheets in one book, you give each box a special name that tells which sheet it's in. For example, you might say "Sheet 1!C10" to talk about a box in Sheet 1. Sometimes, you can even use this naming to talk about boxes in other books too.