Bootstrap provides a front-end framework to efficiently produce HTML pages that look sharp and professional. In the words of one of Lintel's front-end developers, "This is the best thing ever."
Bootstrap's reusable components let you create a uniform look to menus, buttons, typography, and every other design feature your website needs, by simply using CSS classes in your markup, and relying on a a touch of built-in JavaScript to take care of the rest.
About Bootstrap
Originally built by two Twitter employees, Bootstrap is now shared on GitHub so the world's front-end designer and web developer community can use, contribute to, and view its code.
It's designed around a column-based layout with elements of CSS and JavaScript. Bootstrap also includes numerous customizable design options so users can adapt typography, formatting, and other design features to their sites, knowing it will respond right to various browsers and screen sizes.