Originally developed by Twitter, Bootstrap is a front-end web framework that's revolutionized modern web development. It makes it easy to build professional, feature-packed websites in no time. Better still, Bootstrap is built from the ground up to be fully responsive, meaning your designs will look beautiful on any device, and in any browser. Whether you're a designer or a developer, you need to get acquainted with Bootstrap. Jump Start Bootstrap is the perfect primer to the most popular front-end framework available on the Web today.