Function append

Inserts content as the last child of each of the selected elements.

Example

$('ul').append('<li class="plum">Plum</li>');
$.html();
//=>  <ul id="fruits">
//      <li class="apple">Apple</li>
//      <li class="orange">Orange</li>
//      <li class="pear">Pear</li>
//      <li class="plum">Plum</li>
//    </ul>

See

https://api.jquery.com/append/