View the source to see what HTML tags are used to create these tables.  The tags are:
TABLE - defines table properties
TR - the row
TD - a cell

This is a centred table with a border width of 2.  Its cellpadding (the gap between text in the cell and the border) is 20.  Its width is 50% of the width of the browser window.  This table is 1 row by 1 column (1 cell).

 
The border width is 1. The cellspacing (the gap between the border lines) is 5.  Cellspacing is 10.  The table width is 40%.
This table is 1 row by 2 columns (2 cells).

 
This table is 2 rows by 2 columns (4 cells). It is left aligned.
The table width is 400 pixels. Cells can contain images as backgrounds too.

 
Or an image can be positioned on the page by putting it in a cell within a table.  This table has no explicit width setting.  This table (1 row by 2 columns) has no border.

 
 
Top left cell Top right cell
Bottom left cell
You can have tables within tables, as this table (blue background and borders) illustrates. This can be used to control the layout of page content more precisely.
This table is within the bottom right cell of the outer table. It is all done with tables.

 

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