HTML Tables are not to be used for building layouts.
Instead, they are to display tabular data like a schedule or timetable or spreadsheet.
The tags used in tables include:
<table> - the table container
<tbody> - the body of the table
<thead> - the header area of the table
<tr> - table row
<th> - table heading cell
<td> - table data cell (most common tag)
<col> - column definition used inside the table at the top
<colgroup> - group of columns
<caption> - the label/description for a table
Here is a sample table
<table><caption>
This is the label for the table
</caption><thead><tr><th>Mon</th><th>Tue</th><th>Wed</th><th>Thu</th><th>Fri</th></tr></thead><tbody><tr><td>-</td><td>MAD9012</td><td>-</td><td>MAD9116</td><td>-</td></tr><tr><td>MAD9100</td><td>-</td><td>-</td><td>-</td><td>MAD9100</td></tr><tr><td>-</td><td>MAD9015</td><td>MAD9015</td><td>-</td><td>-</td></tr></tbody></table>