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  A worksheet (or page) in a workbook contains 16,384***columns***that are labelled using letters of 
  the alphabet. The first column in a worksheet is labelled column***A***, while the last is labelled***XFD***
  
  A worksheet (or page) in a workbook contains 1,048,576***rows***that are labelled using numbers 
  from 1 to 1,048,576 
  
  Where a column and row intersect we get what is known as a***cell***. You enter your data into 
  these cells. Each cell in a worksheet can hold up to 32,767 characters – although it would be 
  unrealistic to ever push it this far. Cells are referred to by their column and row labels. For 
  example, in the screen above the cell we are pointing to is***C11***– this reference is known as the 
  ***cell address***and is most important as it is frequently used in commands and formulas 
  
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  When you start typing something, you want it to appear somewhere in the worksheet. As a 
  consequence when the Status Bar shows***Ready***mode, at least one cell in the worksheet will be 
  highlighted – this is known as the***active cell***. In the screen above, the active cell is cell***A1***– 
  notice that the column label and the row label also appears coloured to indicate the active cell. 
  You can have more than one active cell – when this occurs you have what is known as a***range***