Tables are defined using the <table> tag.
Table rows are defined using the <tr> tag.
Each row is divided into table data cells using the <td> tag.
To create a border on the table use the tag <table border="1">.
Here's an example from W3Schools:
<table border="1">
<tr>
<td>row 1, cell 1</td>
<td>row 1, cell 2</td>
</tr>
<tr>
<td>row 2, cell 1</td>
<td>row 2, cell 2</td>
</tr>
</table>