Responsive Web Design has developed in recent years to become an approach to the device for the delivery of content to users. The use of mobile devices to surf websites is growing day by day, but most sites are not optimized for these mobile devices. There is a constraint display size on mobile devices, so different approach is needed on how the content is laid out on mobile screens. From a mobile browser on an iPhone all the way to an HDTV, sensitive sites are able to adjust their appearance depending on the screen size. With new inventions every day, screen sizes are constantly changing, so it is important that your website is suitable for all kinds of screen sizes. This is a wonderful approach to the problem of designing a website for a number of devices available to customers, ranging from smart phones to large desktop monitors.