Bootstrap 4 is an open source and powerful framework for developing Responsive websites. We can easily develop websites using bootstrap.
Bootstrap was originally created by a designer and a developer at Twitter in mid-2010. Before being an open-sourced framework, Bootstrap was known as Twitter Blueprint.
Bootstrap 4 is the latest version of Bootstrap. The older version of bootstrap is Bootstrap 3.
Bootstrap have many more advantages:
Bootstrap 4 CDN
If you don’t want to download the bootstrap then you can put the below url in the head element of your html file to use bootstrap.
<!-- Latest compiled and minified CSS -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css">
<!-- jQuery library -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<!-- Popper JS -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.0/umd/popper.min.js"></script>
<!-- Latest compiled JavaScript -->
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/js/bootstrap.min.js"></script>