By the help of bootstrap a website is resize in any device. If we are using Mobile then the website would be responsive according the device.If we are using in computer then its show according to the computer size
History of Bootstrap-: Bootstrap was developed by Mark Otto and Jacob Thornton at Twitter, and released as an open source product in August 2011 on GitHub.
Why are we use Bootstrap -: Bootstrap has easy to learn. It is easy to learn. basic knowledge of HTML and CSS can start using Bootstrap. It is provide responsive facility to mobile, tablets,and computer device.
Bootstrap is comfortable with all modern browsers (Google Chrome, Mozilla Firefox, Internet Explorer, Edge, Safari, and Opera).
How to download Bootstrap-: This is a one line code. You can download this code using this link
By click this button you can download bootstrap code here
After downloading the bootstrap file unzip this file. you can extract the file and use this code into your website.
or copy this cdn code css and java
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous"> <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script>
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"></script>