Responsive sites and adaptive sites are the same in the sense that they both change appearance based on the browser environment they are being viewed on. One of the major challenges in creating a web design is how to create one that has lasting value, at least for a planned period of time. It is more likely that a first time visitor/customer may not be familiar with your products or services. There are other possibilities that your visitor is in a real hurry, or they’re on an iPad, at a coffee shop. Or maybe they’re on some device for which a website hasn’t been planned yet.