With a workbook open, you see the worksheets it contains. Figure 11–2 shows a workbook that has data entered on various worksheets. The labels on the figure indicate what the main elements of the Excel user interface do.
Figure 11–2. The main elements of the Excel program window and a workbook
NOTE: Selecting a column heading selects that whole column, enabling you to format all the cells in the column or enter data in them all at once. Similarly, selecting a row heading selects the whole row, enabling you to work with it as a whole.