A responsive site adjusts to the pixel width of the device upon which it is being viewed. A responsive site isn’t just a site that “works on a cell phone,” it’s a site that retains the same level of user experience as it would on a desktop computer on every single device. The smart phone devices are most commonly in use these days. According to a calculated figure, 5.1 billion, out of the 6.8 billion-world population are the smart phone users. This further endorses how important it is to shift to the responsive website designs, in order to create a better user experience for the billions of people.