A web design that responds to a user interface and readily communicates with users. "Responsiveness" refers to an application that reacts to user queries as much as feasible. In the mobile view, an application's responsiveness is employed. This means that the app displays content optimally on any device without the need for multiple versions of the same application. For example, if an application does not respond to a small screen size by displaying content in a compact format, then it is not responsive. An example of an non-responsive application is one that does not scale down its layout so that it can be displayed on a phone or tablet screen. Such an application would look bad when viewed on a small device because there wouldn't be enough room to display all the content. Mobile applications should be responsive because only through this approach can you provide users with a good experience on any device. Without responsiveness, you might get lucky and have some people using your application on old devices, but these are likely to be the exceptions rather than the rule. In fact, Google recently announced that it will no longer support browsers older than IE9 because most modern websites work perfectly well without supporting these older browsers. The importance of being responsive cannot be overstated. There are now more people using smartphones and tablets than desktop computers, thus demonstrating the increasing demand for responsive apps.