Source: WebDesignerDepot.com
Bootstrap is a powerful, mobile-first, responsive, front-end framework that’s built with CSS, HTML, and JavaScript. It offers a ton of advantages over starting from scratch, and even over many other frameworks.
Bootstrap was originally developed by a designer and developer from Twitter, it’s become one of the most popular front-end frameworks in the world. It was first known as Twitter Blueprint, before becoming open-source, and served as Twitter’s internal style guide for over a year before it was released publicly.
If you’re unfamiliar with Bootstrap, the resources and information here will get you up to speed.