Around the World, three out of four people use their mobile devices for internet browsing every day. Resolution widths can range from 320px (iPhone) to 2560px (large monitor) or even higher, and by using a responsive design your website will be optimised for all of these environments. Plus it’s future proofed for formats that don’t even exist yet. Responsive design is the term given to websites that detect the browser width of the device, and adapt accordingly. A responsive website will rearrange elements on the page, so that: By using technologies like jquery,javascript,extjs ,html,html5,css tries to reduce or remove the use of technologies which are not cross-device friendly, such as Flash, to device detection to show discrete platform-specific interfaces. This ensures your site and any media on it (like videos) can be viewed on iPhones and iPads as well as desktop computers.