class="selected" what does it mean

Question

<h1><span>My Coding Schedule</span></h1>
<table>
<tr>
<th>Day</th>
<th>Mon</th>
<th>Tue</th>
<th>Wed</th>
<th>Thu</th>
<th>Fri</th>
</tr>
<tr>
<td>8-8:30</td>
<td class="selected">Learn</td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td>9-10</td>
<td></td>
<td class="selected">Practice</td>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td>1-1:30</td>
<td></td>
<td></td>
<td >Play</td>
<td></td>
<td></td>
</tr>
<tr>
<td>3:45-5</td>
<td></td>
<td></td>
<td></td>
<td class="selected">Code</td>
<td></td>
</tr>
<tr>
<td>6-6:15</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td class="selected">Discuss</td>
</tr>
</table>

Answer 1

It is for styling

Click into the CSS tab and you see

.selected{

}

Answer 2

Thanks