Inténtalo tú mismo - Bootstrap tooltip

<!DOCTYPE html>
<html lang="en">
<head>
  <title>Bootstrap Example</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="/lib/bootstrap.min.css">
  <script src="/lib/jquery-1.12.2.min.js"></script>
  <script src="/lib/bootstrap.min.js"></script>
</head>
<body>

<div class="container">
  <h3>Tooltip Example</h3>
  <p>The data-placement attribute specifies the tooltip position.</p>
  <ul class="list-inline">
    <li><a href="#" data-toggle="tooltip" data-placement="top" title="Hooray!">Top</a></li>
    <li><a href="#" data-toggle="tooltip" data-placement="bottom" title="Hooray!">Bottom</a></li>
    <li><a href="#" data-toggle="tooltip" data-placement="left" title="Hooray!">Left</a></li>
    <li><a href="#" data-toggle="tooltip" data-placement="right" title="Hooray!">Right</a></li>
  </ul>
</div>

</body>
</html>