Alerts in Bootstrap

 Alerts: Bootstrap's alert component can be used to display informative or warning messages to the user. Here's an example:

html

<div class="alert alert-danger" role="alert">

  This is a danger alert—check it out

</div>

This code creates a red alert message with the "danger" class. Bootstrap provides several different types of alert classes, such as "success", "warning", and "info", which can be used to change the color and appearance of the alert.