A programme that works with rows and columns of data, is known as a "spreadsheet". A new document, by default, has three worksheets, which are effectively three "pages". The collection of all horizontal fields in the same line are called "rows", and vertical fields up and down in the same line are called "columns". Each field, or intersection of a column and a row is known as a "cell". A "command" is an operation on a cell, or a collection of cells.