The :last-child selector lets you select every element that is the last child of its parent, while the :last selector selects only the last one from the element set.

Syntax   $(":last-child")

Example

<!doctype html>
	<html lang="en">
	<head>
	  <meta charset="utf-8">
	  <title>first-child demo</title>
	 <style>
	  span.solast {
	    text-decoration: line-through;
	  }
	  </style>
	  <script src="https://code.jquery.com/jquery-3.4.1.js"></script>
	</head>
	<body>
	 
	<div>
	  <span>Sibin,</span>
	  <span>Jobby,</span>
	  <span>Bobby</span>
	</div>
	<div>
	  <span>Kevin,</span>
	  <span>Shorn,</span>
	  <span>Ginu</span>
	</div>
	 
	<script>
	$( "div span:last-child" )
	  .css({ color:"green", fontSize:"80%" })
	  .hover(function() {
	    $( this ).addClass( "solast" );
	  }, function() {
	    $( this ).removeClass( "solast" );
	  });
	</script>
	 
	</body>
	</html>