Notifications are used to tell the user when an event has occurred. Notifications are less in the user's face and don't take priority like an alert would. For example, a notification is used to let the user know that changes they made were saved. Another example is the negative notification announcing that there is a problem. There are two ways for notifications to be dismissed. They can be dismissed by clicking the X or they can auto-dismiss after a few seconds.
<div class="notification notification-info">
Normal Notification
<button data-dismiss="alert" class="btn-icon close icon-cross">
<span class="sr-only">Close</span>
</button>
</div>
<div class="notification notification-success">
Positive Notification
<button data-dismiss="alert" class="btn-icon close icon-cross">
<span class="sr-only">Close</span>
</button>
</div>
<div class="notification notification-warning">
Warning Notification
<button data-dismiss="alert" class="btn-icon close icon-cross">
<span class="sr-only">Close</span>
</button>
</div>
<div class="notification notification-error">
Negative Notification
<button data-dismiss="alert" class="btn-icon close icon-cross">
<span class="sr-only">Close</span>
</button>
</div>