This document provides an overview and introduction to responsive design using Bootstrap. It defines responsive design as designs that work on any resolution and are user friendly. It explains Bootstrap's grid system and standard device resolutions for extra small, small, medium, and large devices. Key Bootstrap components are summarized like the grid system, Glyphicons, and JavaScript plugins. The basic differences between HTML, CSS, and Bootstrap are outlined. Finally, the main purposes of using Bootstrap are listed as decreasing costs and code while providing an excellent and understandable user experience.