Bootstrap is a free front-end framework for faster and easier web development

Bootstrap includes HTML and CSS based design templates for typography, forms, buttons, tables, navigation, modals, image carousels and many other, as well as optional JavaScript plugins Bootstrap also gives you the ability to easily create responsive designs

There are two ways to start using Bootstrap on your own web site. You can Download Bootstrap from getbootstrap.com or Include Bootstrap from a CDN

Bootstrap uses HTML elements and CSS properties that require the HTML5 doctype Bootstrap 3 is designed to be responsive to mobile devices. Mobile-first styles are part of the core framework.

Bootstrap also requires a containing element to wrap site contents.

There are two container classes to choose from The .container class provides a responsive fixed width container and The .container-fluid class provides a full width container, spanning the entire width of the view port.