Responsive Web Design
Responsive web design (RWD) is an approach to web design that makes web pages render well on a variety of devices and window or screen sizes.
The web world today is not just limited to desktop. People like to multi task and do their web browsing on mobile devices that they can carry around with them. In such a scenario it is important that your site functions just as effortlessly on mobile devices as on personal computer.
Responsive web design has become more important as the amount of mobile traffic now accounts for more than half of total internet traffic.