I don't know your language, but I know what <tr> and <td> mean, if you're able to understand me.
<tr> = table row. It's the entire row.
<td> = table data. It's the individual cells in the row that contain data.
EXAMPLE:
<table>
<tr> <!-- ROW 1 -->
<td>Cell A</td>
<td>Cell B</td>
</tr>
<tr> <!-- ROW 2 -->
<td>Cell A</td>
<td>Cell B</td>
</tr>
</table>
I tried to say it simply since I don't think you speak english. Hope that helps.
