Tables use many tags:

A table:

<table>
  <thead>
    <tr>
      <th>Day of the week</th>
      <th>Mode</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>Tuesday</td>
      <td>In person</td>
    </tr>
    <tr>
      <td>Thursday</td>
      <td>Online</td>
    </tr>
  </tbody>
</table>

An important CSS property of tables is border-collapse, which joins together the borders of adjacent cells (otherwise each cell has its own border and there is a separation between them).

To join cells horizontally or vertically (as can be done in spreadsheets), the attributes colspan and rowspan can be used in <td> elements.